man, it's a cockamouse, which can also fly.

Marshall: No, it wasn't a cockroach, it had fur. And only mammals have fur.
Lily: It was a cockroach.
Marshall: Come on Lily, the only way it was a cockroach was if it was wearing the skin of a mouse it just killed.
Lily: Oh my god!
Marshall: Yeah, it had six legs, a hard exoskeleton like a roach!
Lily: But it also had mouse-like characteristics, grey brown tufts of fur, a tail.
Robin: So which is it, a cockroach or a mouse?
Marshall: It's a cockamouse!
Lily: It's a whole new species, the cockamouse.
Marshall: And it's the size of a potato.
Robin: So what now, a cocka-potato-mouse?
Marshall: Don't make it sound ridiculous, it's a cockamouse.