2. All mammals have hair at some point in their lives, be it the fuzz on a newborn whale, a shield of hard porcupine quills or your long locks.
3. Insects can wear it, too. The microscopic belly hairs on the male freshwater Micronecta may help amplify its mating call. Some scientists think that when the bug rubs its penis against the tip of its abdomen, the hairs trap air and sound, making it the world’s loudest animal relative to its size.
Read all 20 at Discover.