throwing her web over the top.

And then there's nowhere for it to go.

This is an animal that is strategizing

and working out very quickly how best to hunt a very tricky prey.

A lot of her intelligence is built

from the sheer number of prey that she has to catch.

All sorts of animals.

All the mollusks she is capturing, they're quite easy to catch,

but they've got these incredibly hard shells.

Now, how the hell does she kill and eat them?

At the base of all those arms,

there's a drill that can drill through hard shell

and then drop venom in there, like a snake,

and see how that mollusk reacts.

But some of these mollusks will only relax

if that drill is precisely in the apex of the shell,

on the abductor muscle.

She basically has to do geometry

to work out exactly the precise spot where she needs to drill that shell

in order to get her food.