Riddle: What walks on 4 feet when young, 2 feet when it's an adult, and 3 feet when old?
Answer: A human! A baby use it hands like legs, a adult walks on to feet, and a old person uses a cane to walk so it is 3 feet.
Source: https://www.riddles.com/index.php/10471
A Monster? by Chayes Fong Yu Ze Riddle
