Tip:
Highlight text to annotate it
X
Istanbul, the gateway to Europe.
They spiral over the city
before setting off to recolonize the continent.
These storks are among the countless millions of birds
that risk their lives to come to Europe to breed.
Many try to choose the less hazardous route
into the continent.
are used as a guide
from year to year.
For young birds on their first migration,
it's once seen, never forgotten.
One day, they'll use such sights to guide their own families.
The valley is such a popular route,
50,000 cranes may pass through
in a single day.
Many cranes travelling through this valley
still have a thousand miles left to go.
Many flocks spend the winter on the coastal marshes
around Mont St Michel in Northern France.
But in spring they leave for the Arctic.