Why do birds fly south in the winter? Animal Jokes, Bird Jokes Why do birds fly south in the winter? Because it's too far to walk! 👍 Upvotes: 0 More Animal Jokes Why are fish so smart? Why should you buy a bird? What’s the difference between a hippo and a zippo? What did the dog say to the two trees? Why do cows wear bells? What do you call an alligator wearing a vest? See all Animal Jokes →