A zebra lived her whole life in a zoo but was getting on in age, so the zoo decided to let her spend her final years on a farm. The zebra was excited to see a huge pasture with green grass and hills and many strange animals.
She went up to a fat brown thing and said, "I'm a zebra, what are you?"
"I'm a cow."
"What do you do?"
"I make milk for the farmer."
Then the zebra went up to a little white bird and said, "I'm a zebra, what are you?"
"I'm a chicken."
"What do you do?"
"I make eggs for the farmer."
Then the zebra went up to a handsome beast that looked a lot like her except with no stripes and said, "What are you?"
"I'm a stallion."
"What do you do?"
"How about you take off them fancy pajamas and I'll show you!"