Baboon funny joke

This is a baboon

This kindergarten teacher was
taking her class to the zoo for a
field trip. They came to the cage
for the zebra:
TEACHER: Who can tell me what
animal this is?
BILLY: Well, it looks like a horse,
has black and white stripes. Must
be a zebra.
TEACHER: Very good, Billy.
They come to the elephant.
TEACHER: Class, who can tell me
what animal this is?
JANE: It has big feet, is very big
and has a trunk. Is it an elephant?
TEACHER: Very good, Jane.
They come to the baboon cage.
TEACHER: who can tell me what
animal this is? No response.
Finally Johnny raised his hand
reluctantly.
TEACHER: OK. Johnny, would you
like to try?
JOHNNY: Well, it has a big belly and
has a lot of hair all over, and has a
stupid look on his face... must be a
truck driver.