My Future Zoologist? Maybe Not.

I saw Ben's future career as a zoologist go down the tubes this morning:

BEN: Guess what animal I'm thinking of. It's brown.
ME: Does it have fur?
BEN: No. It's a kind of bug.
ME: A worm?
BEN: No.
ME: A spider?
BEN: No.
ME: An ant?
BEN: No.
ME: I give up. What is it?
BEN: A hedgehog!