Because he kept running out of the pen.
Paul stop monkeying around!
A jolly rancher.
www.innie the pooh.
Because their Zoos ran out of room.
To shake out the alligators. I've never seen an alligator In a tree. That's because the pigs do such a good job.
Neigh-boars.
It's mother was in the pen and it didn't know how long the sentence was.
ME, SECRETLY TRYING TO HARVEST HER INK: Something super scary *I empty my popcorn bucket*
Uni-ball
Because it came out of the pen.