Naming animals

[funmonger]

There are some children in a class naming animals and they come across a picture of a deer.
So the teacher asks Bobby, “What is this animal called?”
“I dunno,” claims Bobby.
So then she says, “I'll give you a hint - it's what your mother calls your father.”
The boy thinks for a minute and then says, “Oh that's what a son of a bitch looks like!”