The usual conversation goes:
Me: It's an axolotl.
Them: A what? Looks like a weird fish to me, with legs.
Me: It's an aquatic salmander.
Them: What, like a lizard?
Me: No, it's an amphibian like frogs and newts, not a reptile like a lizard or snake.
Them: Doesn't look like a frog...
Me: Thats because it's not. It's a neotenic salamder that never makes the transition to land-creature like frogs and newts do. It stays in the water its whole life.
Them: Well how does it breathe if it stays underwater?
Me: Those fluffy things on the sides of its head are external gills.
Them: If it has gills it's a fish then!
Me: (Shakes head and mutters under my breath about the standard of biology in schools these days) *Sigh*
Them: So can I have one to put in my fish tank with my chiclids?
Me: AAARRRGGGHHH!