Rattlesnake mating sessions have been known to last more than 22 hours.
232
When cats are happy, they may squeeze their eyes shut.
10
A giraffe's kick is so powerful that it can decapitate a lion.
216
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20