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giant megalodon - biggest shark of the dinosaur world [full wildlife documentary hd]
dangerous here editors me
but even the great white
pales in comparison to the biggest shock but
ever lived make little literally translated it means
speak to prehistoric shark
with three me to Jules lined with deadly rooms have serrated
T make good on use these tools to inflict massive damage
on even the biggest whales in the ocean its teeth
was huge 62 maybe seven inches long
wickedly serrated on either side like steak nyse: and shaped like a big draw
triangle
now
two million years after the last Megalodon mysteriously disappeared from
the fossil record
scientists are investigating the true shape size
and behavior one of the most fearsome predators
in history
sea water covers almost 70 percent to be earth's surface
this is where life on our planet
first began and some of these early underwater creatures
with pink predatory fish giant squid
stingrays to Wales and other dangerous predators
have long room to the sea and 300 million years before T-rex took its
first bite
and apex predator were scouring the watery depths
the show
paleontologists
have found remarkable fossil evidence that these predators
going back more than 400 million years the biology of the Sharks
has remained remarkably stable for all this time in
if you look at a shark from say three and fifty million years ago
you have no trouble identifying that as a shark may have some differences
with what we think it was for the conventional look at sharks today but
you would
you would not be confuse you would know right away you're looking at a shark
well though many of these prehistoric shocks are now extinct
the great white shark which still roams the sea today
has survived more than 10 million years
it has become the ultimate
ocean predator
up
but the Great White paled in comparison
to another giant shark between the seven seas
dominating every other predator in the ocean I'm
make a lead on literally translated it means big to
I'll make when I was a giant fossil shark
live from maybe twenty five million years ago up to about two million years
ago
the largest oceanic predatory shark that we are where I'm in the fossil record
fantastic huge enormous pressure that the likes of which the oceans hadn't
seen before sent
it was one of the
biggest predators a ball time you got these massive
razor blade sharp teeth attached to an animal the size of a Greyhound bus
I mean this was the ultimate predator never has an apex predator
made such a huge mark on the planet only to leave so
little trees have itself behind up
is like the ultimate the detective story would surely don't know exactly what the
magma now look like we can only assume how I'd
locked in how I killed up
in order to solve this mystery scientists need fossil evidence
but in the case have Megalodon on there are no skeletons left
to study this presents a major challenge to researchers
all creatures in the sea
or on land begin to decompose and fall apart
the moment they die for those with skeletons
within a short period of time all that is left
the bones but when it comes to make a lid on
there's a huge the Sharks skeletons constructed almost entirely of cartilage
consequently there are very few fossilized remains
left to show scientists the size and shape if this gigantic fish
cartilage pliable and light
it's the balsa wood if the body but exposed to salt water
sand and especially bacteria Megalodon skeleton
has little staying power the the cartilage
is this brownish yellow material that's the flexible
component the cartilaginous skeleton you can actually see the little tiny prism
its which had structural support and rigidity
to the otherwise flexible cartilage and that's what gives the skeleton its
strength
however because these individual little presumes of cartilage are held together
with organic fibers after
the shark guys those organic fibers can then
D compartments within weeks
shark cartilage breaks apart and disappears
your my
up of the TIF
protected by an animal coating a one of only two parts of the skeleton
to survive in these massive teeth
are extremely long scientists are using them as the building blocks
to reverse engineer the giant shark the only other known fossil remains
are a few small pieces have backbone the Calvert Cliffs
along the Chesapeake Bay in maryland are a well-known site for uncovering fossils
have prehistoric shocks
doctor Steven Godfrey has been digging for fossils here
for more than 10 years in that time he is not found a single make a left onto
this is great tides where along with doctor britton can't
got three scours the area searching for fossil to use
all as a shock to willa now
altruism own rare the through
for about 3 12-14 work Mon shark on the roots missing
just the crown you gotta see this after a few minutes of searching the face of
the cliff
doctor godfrey Spy something about a meter the wall
this has never happened to me before good man
well is not very big but it's a magazine really nice condition and is just sittin
there
this is so sweet you can see the serrations on its pristine
me check that out oh absolutely right that all that is gorgeous
incredibly
on the one-day cameras are there to record their fossil hunt
go trick strikes are rare 10 to 12 million year old Megalodon shark tooth
from the CLI latent cliff nice upper lateral
new phone till you know any better than that
that right that's beautiful a gorgeous one
that's very nice where the interesting things about this to
it knows the camp there's a compression fracture on it
compression fractures when the tooth bites them vertically in strike
something hard like bone XD
winsome free thinker a flake off to the side
back she crushes the chip the power in compression fractures themselves
are very common to make good on them compression fractures and other violent
accidents from
biting down on their prey have resulted in a unique biological adaptation by
sharks
over the last four hundred million years constant and lifelong
to replacement over a 25-year life span
a shock will shed approximately 20,000 T
Wed other predators such as crocodiles
also replace T but to produce so many in a lifetime
is a characteristic unique to the shock
the shark's mouth and gums containment endless conveyor belt
replacement teeth just below and above the gum line
waiting to flip forward and take their place in the front row
T these make love don t can i unlock a tremendous amount of information
about this creature which appointment to the rest is gravy
the day these men million
yeah good with the pound teeth piling up in museum collections around the world
interest in Maitland on intensified over the last few centuries
I'll in 1909 because the artists and paleontologists in New York
at the American Museum of Natural History labored with great effort
to build what they thought was the ultimate make it on Jordan
the finished your caused a sensation showing a gaping
three-meter -high collection that nasty shop HT
the date made some crucial errors in their reconstruction
the paleontologists continue to correct and refine
even today to adjust in shock collector doctor gordon hubbell
has been studying shock teeth and jaws for four decades
back in early 1900s when they reconstructed that make good and jar
besides having problem with keeping the teeth in the jar
they didn't know that down for me when the new didn't know the den arranging to
make good on so the teeth were just put in kind of haphazardly
in constructing the display the scientists appear to have chosen the
largest
T available from fossil deposits around the world
the dimensions reflected that the jewel
was enormous the 1909 effort
eventually raised questions with the teeth going front to back
all be that large and then there were the sheer number of teeth in the jewel
it seemed excessive this version has made let on
have more teeth from the bottom great white
these doubts fueled an even larger debate
is the modern great white shark the best comparison model for the size and shape
make a lot on how closely related to these creatures from the team
ryan Johnson has been studying the living great white shark
up close and personal in the waters off the coast of South Africa
I think when the guys discover the huge fossil iced tea
they want to find something today's world that possibly was similar
and ninety real shot that springs to mind as a gray my shack
and so this is why you always get this constant comparison between the Great
White
and make good on was a wide shot just a little vision
on what may lead on was back increased our times on
the massive predatory great white holds a mythical place in the mines a
fisherman
sailors and other sea lovers the maximum size a great what gets
is probably a man shot biologist much-debated
question as we've talked about speak to any fisherman ABC's mike nights
twenty-foot long and it was too for that way to for that way
must be 25 26 foot and is probably not the case
in truth the largest modern great white sharks
are believed to be about six meters long with a maximum weight
around eighteen hundred kilograms
make it on is commonly thought to reach between 15 to 17 meters
with an almost unimaginable wat 45,000 kilograms
I a comparison is pretty good between the great weisman a good on
but you also must remember that any information we have about to make is
from st.
I think the main similarity between tea for the mag
and the T the right what other than that big size is probably the serrations
the triangle serrations and what that shows me believe
is that by shocks rather than swanee prey whole
was taking chance at a very big cry possibly is because in South
in 1988 scientist Gordon hubbell received a call from a fellow fossil
collector
about a remarkable find it a phosphate mine in Florida
larry martin uncovered a set of 95 teeth
from one may click on shock this match set
became the Holy Grail have made good on research
they unlocked part of the mystery surrounding this astounding creature
when this is the most complete
said Associated when we don t think there've been found
the reason was insignificant his say once we can arrange the steam
we can figure out if the animal is truly related to the white shark wine or if
it's related to some other
species of shark eighty years after the first drawer was constructed
hubbell's teeth may hold the key to understanding the true shape and size
the greatest predator the sea has ever known
make a lot on
a ferocious predator petrone the seas for $20 million years
and all that's left is the T and a few scattered vertebrae
in 1988 Gordon hubble help to identify the most complete setup make lead on T
but how did these teeth fit together inside the shocks jewel
hubbell was stumped Edward to about 10 years a frustration because
we we didn't know at the time for sure what the dental formula
megaton shark was and so
every time a sinus came to visit us or just anybody
they want to look at the steed we hand them places tease how they thought they
would go on the mound the third tooth
is a prominent feature in the modern great white sharks July
and as we're really bother us it wasn't until we realized that
the Megalodon is entirely different line evolution
and does not have the third upper tooth
that small 22 2010 and indeed has a thoroughbred do that's about the same
size as the first to tee
then we figured it out in everything from the putting
there are 20 40 in the upper jaw the lower jaw has a total of 22 teams
behind the 46 teeth in the front row approximately 200 more teeth lying in
rows
waiting to flip forward to the front and take their place on the predatory
battlefield
on other scientists and museums were now interested in taking that knowledge
and putting together realistic make good on jewel recreation
fossil collector John baby ours
has amassed a huge collection of making it on TV with the help of museum curator
Brad archer
he undertook the task of building and accurate recreation
a make good on jewel no one had done a project be four
least not in the scale that we wanted ideas and Archer
worked diligently to figure out the shape and placement of the upper and
lower teeth
using models and pictures have great white drawers
and early in the cloud on reconstructions right off the bat we
figured out and if the tax benefit
because they're way too big and there's no room in a job unless this certainly
had
14th in a row we know that's not correct first
31st and its move next a hole is drilled in the face of the tooth
and a metal rod is inserted the road is then attached
to the dorm old but they still needed help
placing the teeth in the jewel the men turn to cordon hubbell
and his knowledge associated make it onto sets to see if he could help
organized the T and we looked at all the teeth that he had and we
put them together into a set as closely as we could
in September of 1994
the jewels were finally completed the men loaded the jewels onto a flatbed
truck
and drove into the museum at Arizona State
the results were astounding while not quite as large as the jewel was built in
New York in 1909
it's clear in animal would have to be a massive proportions
to carry a set of jewels this size about this judge approximately
that and a half feet tall and it's about the
a happy way if I remember right and
has about 250 4t in all Realty
I'll once
scientists had an idea about the size and scale of the teeth and jaws
they could start to figure out with the body was like the Calvert Marine Museum
skeleton
paints a vivid portrait at the infrastructure needed to support the
massive jewels
but the next step
was to create a lifelike representation at this beast
what would a creature this size look like
swimming towards you in the ocean to Michael gottfried
who'd worked on the Calvert skeleton now felt confident he could speculate
on this piece might have looked like from the outside collaborating with
artist and
animal model a gin nearly and make model was born
I mean basically this kind of thing as
if the marriage in science and our taking side if the information and
converting at
into as culture a 15-meter
life-size replica rhythmically dawn now hangs in the San Diego Natural History
Museum
so after all the research working with models working drawings working with the
actual specimens that we do have
here's the end result we think is the most accurate and most biologically
possible reconstruction
a make good on its on exhibit anywhere you
from the first make two found by early humans scientists now have a stunning
picture
this massive creature hundreds have teeth
capable of inflicting terrible damage on its prey
a Jew or three meters wide and two meters high
a body at least 50 meters long
may well I was enormous for doing that an estimated
size is this possible giant but it would probably be at ballot on a foot so in
the neighborhood about 50 times
plus truly enormous animal
the question now was not so much what did the shock and its doors look like
but how did they
scientists sometimes look to the fighting and killing behavior
the more than great white shark to try and understand how make it on the Henny
both shocks a thought to use the same frosting
swirling motion to rate gaping holes in their play
during the attack an expedition with Brian Johnson into the shark shield
waters of my cell Bay
South Africa provides a rare glimpse of this behavior
college in that one the flyer
fresh fish live in acts as good shark bait
it's not long before the first strike
yep
guy dressed in a homewrecker because that is his check
yeah check check
with him just 31 to really grasp it i said i buy cheap
but then was he really got a hold on me started shaking his head back and call
took never really what makes wash I can make
Zack not only does it bought and try to grab the stuff to swallow it
stats threshers head back and forth trying to remove pieces
of them all the major credit leading that observation from the deck of the
boat
is not good enough for Johnson good to get a complete understanding of how the
Great White swims
you need to get in the water with the shock new audio techniques provide real
time comment re
Johnson is seen all over and watch out for swimming
is coming from I'll know what engines this
it is to not so bad to rate from his body
brought down to a stealth and I just would like to because the camp
technical this make so I MUST officials claim is a criticism
ship we do some experiments
he is a guy and literally out yet it's made all
reaching great what's to: but how can I woulda and these things are heating up
nineteen twenty miles an hour make it on will probably have needed the same speed
and power
12 million years ago smaller
more agile seem to fear whale similar to the modern-day minky whale
would have been a fairly common prey item from a glut on still
they were tough test the maker dawns hunting affinity although this whale was
only one-fifth the length of the adult make good on
it's still way too massive 9,000 kilograms
using its powerful tale muscles
the 50-meter carnival rockets towards the surface
the whale may not have a higher top speed and make good on
but it was more agile with it or some power and speed
the Midland on have the ability to about the surface of the water
with the 9000 kilogram whale still its doors
in a matter of moments dinner was
one quick killed make little approved
that it had the strength and agility to really oceans of the world
I'm
make it on with the oceans almost
20 million years but even top predators
have to keep their lineage going from generation to generation
most scientists agree that like the Great White
the prehistoric make lead on gave birth to live young
the naked on probably gave birth to only one pop at a time
when you consider that a a neonate a pop
we've been anywhere from up seven to 10 feet long that's
already a very large shark and those baby sharks
were hungry I can see no reason why they wouldn't have
been born ready to attack larger per annum
for her to do so doggone was will see cattles as they're sometimes called
might be just the ticket print apex predators first male
one in the other hines 'em
marine mammals that were pray for make a lid on
where the city council's they were due belongs not manatees manatees are more
recent
evolutionary arrival so do the Lions have
tale very much like dolphins unlike the manatees which have the more rounded
beaver like
in detail the mature dog on was about three and a half meters long
compared to the baby sharks 3-meter body the
based solely on size comparison the baby shark would seem to be at a disadvantage
but size is only one part of the equation
they're relatively slow sluggish animals
this is a section see cal ripken
very heavy and dense and you'll notice that there's this bite mark
running across the red made by the two I'll a very large chart
the hungry baby shark rushes forward
one small
juvenile doggone is slow to react the shock is on it
like time hunting has become of
scientists are also keenly interested and just how long was the lifetime of
these giant shocks
in the fossil preparation laboratory at the Florida Museum of Natural History
doctor bruce McFadden and his students doing cutting-edge research
into the life span and eating habits as prehistoric shocks
and scientists study growth rings within the relatively few vertebrae
make it on that are known to exist this
is one way to discover more about these magnificent beasts
and their daily life we can just way to me would count reruns
the lower portion over shocks vertebra is known as a central
in make good on central extremely rare scientists are looking at a few samples
they have
to see what else they can learn about this prehistoric beast
most in this sample so we have indicate that mainland only if
somewhere between 25 and 40 years it probably could have lived longer because
it didn't have any predators
I'm estimates of how much to make it on needed to eat
range from 600 to 1200 kilos through today
this high-energy animal must've been consuming a wide range of fish and
marine mammals
to sustain its life we don't know exactly
what foods they were feeding on no matter what they were eating
one thing is clear: these massive shocks spent the bulk of their lifetime
in the never-ending search for food and fifty million years ago
my scene people conditions were filled with a variety of marine life
from which to make good on could choose a medium Wales
dolphins dougans shoot sea turtles
and hosts a fish through the coastal sea waters around the world
to make good on this probably eating them all I'm
the most common group of Wales during them I seen was the set of their
the small whales ranged from 3 to 6 meters
and were found in my coastal waters or around the world
whale that fed on plimpton crustaceans and tiny fish
these ocean mammals were quick and agile despite the hefty 92 18,000 kilogram
size
like that they're gone these gentle creatures were likely easy targets for
the hungry make it on
but doctor Steven Godfrey has one piece whale backbone that may demonstrate make
good on was not always successful in its hunt for praying
unfortunately the surface at the bone is worn the secret to what happened to the
way you
is hidden from sight inside the vertebrate
from about half of the table now do you want the entire thing
standards after about doing the modern cat scan can help
got reuse is today's technology to look back some 12 million years
it reveals the severity of the ancient wales
injury a compression fracture runs the length of this vertebra
doctor godfrey theorizes what might have happened when the small whale was
attacked by the massive magnet on
I believe that this whale was hit by
the giant me going on and that the intense
impact calls the vertebra to experience this intolerable strain that popped the
bottom the verb wrong
pushed it forward and the healing that going on here in this Burris evidence
that
in spite of the intensity and the impact it
it survive it is the story of one making dawns missed pray opportunity
and one Wales fight to get away
perhaps this time when the prowling make good on looked up at the surface of the
water
there was applauded three whales swimming by full-grown adults
closer to 6 meters and weighing in at 18,000 kilograms
the Maglite on positions itself under the whales for an ambush
in
the small whale waivers
and the giant shark cannot adjust its trajectory megatons massive jewels miss
their targets and his head smashes into the whales back
the cat scan proves this time the whale escaped
the whale was lucky
in most cases it was easy prey for Maglite on
I'll the 20 million years ago
there was another marine mammal but couldn't match make it owns aggression
home this is a scholar
uninjured will call the squad on and these animals critical okayed
and they were probably top predators but I'm spalla I'm gonna beat up pretty
formidable opponents power and then get as big as make good on but they got
pretty good sized 25-30 feet I think would be a
a pretty good estimate for reasonable size call on Wed
Squalicum top predator but today's transient concurs
munter good any behavior extinct animal we have to look at modern animals
in the case that the squad ons we would probably look
at the modern killer whale whales have been known to
attack sharks is not simply a one way street for sharks attack well
squandered on at a maximum length 9 meters would not have taken on a fifty
me to make good on by itself
but they would fight I'll to make good on spotted a squalid on
it wouldn't have hesitated to attack
scientists believe these marine mammals may have traveled Imports
squall on being a big tent whale
would have been a highly intelligent animal make good on not so much
higher reasoning powers and sharks not a
nearly as well developed as you as what we find in marine mammal
even an enormous
animal like nicolette on is going to feel this punch in the Gaels
this time its outnumbered
the first split on may not survive for long
but the Maglite on a sustained a few battle scars have its own
not all attacks were successful I like all creditors our only a certain
percentage of their attacks actually resolve
in killing a pray that they didn't consume but prey species
other than school at dawns and %uh gongs may have provided richer pickings
they were also large whales swimming in the coastal waters at the plan saying he
talk
really large whales and when they played on wanted a three course dinner
it may have gone after a beast even bigger than itself
I'm
the modern blue whale is a magnificent animal
rarely photographed and usually seen only by accident
this massive marine mammal is a startling reminder of the also Majesty
have some of the Seas most elusive creatures five million years ago
the whales Maglite on encountered may have been almost as impressive
here I'm just thinking about what modern
things like 10 wheels and we will supply on it would have been a
a coastal animal would have been a migratory animal point was
gray with a lighter shade below we use estimate the
the weights at Living million whales are about to come to put some
unanimously five to eight feet long and be about 25 28 eternal
so you got at least five species there
you know those actually look like her fantasy team we're kinda
to their doctor lawrence Barnes and his colleagues
have uncovered hundreds of whale bones in the last few decades
one intriguing discovery was a large whales found near Santa Barbara
with the shock to tip stuck in its Jordyn he was a creature
that was possibly three to nine meters long government led on
the whale that would have outweighed the shock by 22,000 kilograms
way but the reward for killing a larger whale
would have been a much bigger food source for the Maglite on away love this
size
is packed with layers a tough stringy blubber make good on would need
all let the size fool you and deadly serrations along XD
to take down the animal the key this time is bite force
how much job power didn't let on actually have at the University of New
South Wales in Australia
talk to Stephen Drew is using high-tech computer sleuthing
to try and understand the cranial mechanics bite force
found in modern and prehistoric animals bite force
is the amount of pressure applied when the jewels have an animal bite down on
its prey
what's generating the bite force he I
up the actual Joe closing muscles what we looking at
is a simple leave the system so we
apply force on one into the lever and
we get a reaction force on the other into
believe it Bros process for understanding bite force in sharks
starts with the gruesome task of cat scanning a shock at
at a local hospital in I've been billed
I a super small and from bat
I can then create a solid three-dimensional
engineering model for not element model
from this engineering model row has figured out the potential maximum bite
force
of the modern great white shark in the case
over really big 1.0 and we predicting a bite force
around about four thousand pounds these largest
but what point is are really pushing the envelope as far as
living animals were considered with the bite force per inch data from the Great
White
row extrapolates what he believes to be a fairly accurate understanding
if the point four Super Megalodon shark the world operator vestments a body mass
for Miguel adorn we getting by poor system it's about
40,000 which is just humongous
with 40,000 pounds about force you about your truck
if you had to take control stand up to I'll
this must have been absolutely Terrebonne object to anyone
because living large by Les Miles get very very anxious
when they say your he orcas or killer whales
about the side of one of these guys coming coming at them must remain just
absolutely a review the billion quayle didn't have much time to be anxious
once the attack had begun it would appear that may be alone
typically took out a large boils by
swimming up behind them by thing that power flickers of basically
just disabling the world's propulsion system altogether way
this is certain death the whale
as he bleeds out through a gaping hole in his artery on
but with no hands to hold down his enormous pray
how did to make good on keep the 68,000 kilogram whale
from swimming of after one bite to the belly of throat
at Wright State University in Ohio
paleontologist chunks impact here has constructed an experiment
the demonstrates the deadly potential at the Midland on to attack
giant prey item a high-density Joan old
will simulate whale flash centerpiece at the demonstration
as a set of mechanical magnet on Jools that he believes
simulates the you need to chill motion of the shark's mouth these jobs are
really interesting because in addition to being able to
with up and down they also are highly mobile
in a forward direction just like modern laminated and
mail I would have been also the metal jewels are firmly attached to the table
and instead of having the Georgia Tech the mold the bite
is replicated by having the mold rolled into place inside the mouth
well shock uses its lower teeth
to initiate the attack and hold its prey in place
we can see the lower teeth anchored into the flesh a good three inches it's
already starting to tear the flash
this is holding down the flash and now the top is going to make its by
the upper jaw bites down on the prey with its powerful
serrated teed at that point
make good on with thrust back and forth into a bite was made
the bottom drawer continues to anchor into the jail
match while the unique up a jewel with its ability to move somewhat
independently from the rest of the skull
takes bite after bite pulling flesh into its mouth
as it continues to feed okay
we've created massive wounds to our prayer Adam
we can see that the teeth made huge couch March
has split of nearly half for the flash now if this was the actual shark
this piece of flesh would extend out in both directions probably three or four
feet because
the size of the jobs and he would have probably nearly 40 T sinking into the
flash
in the mechanical jewels leave no doubt
about the powerful combination a bite force and cutting power
that make good on used on pre at the Santa Barbara wailed
within minutes the whale is nothing but a tasty carcass
voting south along the California coast for one more day
make lid on has found a meal very big meal
but unfortunately for make good on during the play scene he poke
ocean temperatures started to cool the numbers have whale species what went so
diminishing
make good on his reign as the all-time apex predator at the sea
be nearing its end in
make good on disappeared from the fossil record during the place to see me pock
around 1.8 million years ago scientists are unsure why this efficient hunting
machines time
at the top of the predator list came to a close
extinction is always something that fascinates people
we want to know not only how things play we want to know why they died why
they're no longer around why they're no longer with us
the assumption there there was always that extinction is
somehow befall the animal species because extinct because it was poorly
adapted
a negative thing that's not necessarily always the case clearly
species want to perpetuate their existence paleontologists are unsure
what finally killed off the shock
put another apex predator a killer whale
have wiped out the Maglite on another intriguing possibility
these changes in climate 62 1.8 million years ago
just as Megalodon teeth disappeared from the fossil record
scientists have noticed a cooling at the ocean temperatures
this may have adversely affected a shock accustomed to swimming in warmer waters
paleontologists also know but as the my scene he Park progressed
the population of small whales was replaced by larger Wales
these whales may have favored colder climates to the north of
it might very well be that as well became migratory and spent
summertime in or related when in fact
the the Sharks just work are and have access
for them the big welt
by the middle of the playa seen without year-round access to larger prey
make lead on may have been feeling acute hunger pangs
on with a loss a large portion of the wells perhaps three-quarters of all the
whale species at the time
we ended up losing a major food source for mega like
the giant shock would have become increasingly desperate for food
cannibalism was always a possibility with make it on but could have increased
other sources are through seasoned small a magnet on teeth have been found in
deposits
alongside other marine mammals that would prey items for the shock
there is speculation that these juvenile *** owns
may have been at risk from bigger hungrier makes
the closing of the land bridge in South America
may have also affected the worldwide migratory patterns have some marine
animals
the disappearance of the Central American seaway and its replacement by
Lambert
on and the effect upon marine
organisms has been debated among scientists we look at things like even
modern *** whales
the same species exist and both Atlantic and Pacific and the question is
are they going around the southern continents or
are they just very slow to evolve
it is unclear if the closing at the Isthmus of Panama
that connects North and South America could have affected me glued on
of scientists continue to search for clues about neglect on
and its demise by studying the great white shark
of the starters
the modern Great White is equipped with the remarkable internal heating system
known as john turned to for me which isn't excellent survival to
West fishy cold-blooded and the grey white isn't as warm blooded
elevates its body temperature up about their and the water temperature
which for a long time with the characteristic soul reassigned to
mammals
and they do that with a special system a blood vessel
did actually warms the blood that supplies critical part for the Sharks
century biology so the eyes the No particularly
paleontologists have not yet figured out it may get on possessed this
extraordinary biological capability
if they did not as temperatures cooled
it's possible the great white was in a better position
to withstand the dip in the ocean temperatures of
more importantly scientists believe having more variety in its diet
probably helped the great white shark wanna make good on was primarily
planning on larger marine mammals the Great White was able to eat smaller prey
items
and fish they need less biomass to keep going
other probably not as much pressure if you will is there is
an apex predator the size that make good on which would mean
need a tremendous amount of biomass to maintain is its existence
in essence
unlike the Great White make it on may well on its way out of existence
good great white was clearly
more adoptable animal and as a result it flourishes in
oceans around the world to this day the question is whether these two
magnificent shocks were related
continues to interest scientists paleontologist
chunks in patio and other experts insist there was little direct relationship
between make good on
the Great White according to Sam Paglia advanced computer technology
underscores the differences between the two animals
big one of the things I like to see cleared up is that to allow may go on to
be called
you know Car Care cleese magnet on change the name separated out from the
Great White
and let's get on with business at this point the great white tooth
and make it onto do have some markings in common
both a triangular and serrated but the great white tooth and its prehistoric
and sister
have little or no scar at the base whereas the magnet on
clearly has a prominent chevron shaped scar and blowing up the great white to
the same height to the Megalodon tooth reveals that even at the same length
the Great White fossil to is new to certain in
and more grass I'll in the make it onto well let me
let me do the converse here let me show you a very small magnet on
about approximately the same size as this great white
and you can see that small size is the make good on doesn't look the same
again the serrations densities are different this tooth is distinct from
this great white no matter how big you make it
the team compared the dentition at the modern great white
texting maco and make left on and what we found consistently
was whether we're now we look at the root the blade or the entire to
was that the extinct maco and great white always clustered together for
every 2 position
well maybe when I always clustered away may go on a grey white or not directly
related
megan is not texting great white in all scientific evidence points to this
does it looking all the way back to the first
Joel recreation in 1909 there are scientists
who still insist the great white shark is more directly related to the Maglite
on
the smoking gun rare fossilized make it on vertebrae
backbone anatomy suggests that may go down in Great Whites
are quite closely related to one another these researchers
a turn into work being done on the Sentra magnet on vertebrae
to support this theory I think because they were table center haven't been
as thoroughly study they provide some very important clues and I think they
they ought to be studied very carefully butt naked on Sentra
are not common worldwide for the
sixteen or seventeen million years that it lived
we probably have on the order of a dozen to two dozen
vertebral centra Maglite unpreserved
it'll be sometime before scientists can collect more comprehensive data in this
area perhaps the information locked inside the vertebral centra
can finally answer the question of whether or not make good on his legacy
lives on in the great white shark
one point everyone agrees on is that there is much more to learn about the
physical makeup and behavior
that make good on and one thing is certain:
a unique combination of physical size to shape
George strengthened appetite created an animal unique
in the 400 million year history of shocks
big to is still the all-time king
at the sea