The Sphinx, ancient Greek riddler, was really annoying. Poor travelers: "Let me in to Thebes, Ms. Sphinx. I have no clue what the creature is that 'walks on four legs in the morning, two legs at noon, and three at night." But those long-ago travelers probably secretly relished trying to solve the riddle, just as we do today, because riddles are fun even if entrance to a city is on the line, and figuring out the answer to riddles makes us feel smart. (The famed ancient riddle's answer is "human beings.")
The Sphinx riddle's association with a creature that's half-lion makes this list of animal riddles particularly appropriate. Don't feel bad if you don't get the answers right away - some of them are truly mind-boggling, no matter how silly you feel when you see the stunningly simple answers. For the most mind-stimulating experience, cover up the answers and try to figure out these difficult animal riddles before peeking.
Answer: The horse operates a mill and travels in a circular clockwise direction. The two outside legs travel farther than the inside ones.
Answer: Walk around the tree so the dog follows you until there’s no more rope left on his leash, then pick up the ball.
Answer: One; it takes two rabbits to breed.
Answer: A goose.