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Just at the end of my finger, is a small mollusc, and it's called Sap Sucking Slug.
And this group of animals don't have a shell, and generally have chemical defences
but they've also got some other neat adaptations for survival.
this particular slug has crawled inside part of the algae, the green algae, and is eating it from the inside out.
And so what it does it has a small radula tooth inside its mouth which is like a single knife
and it uses it to pierce the cell-wall of the algae, crawl inside and then eat from the inside.
It's quite a fantastic way to hide from predators as well as getting your food.
So it's quite a neat little animal, and very hard to find. It was actually found by John Huisman,
when he was looking at this sample of algae.