Sloths take two weeks to digest their food.
243
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Jellyfish as a species are actually older than dinosaurs and sharks.
383
Cats and dogs can hear ultrasound.
350
A puppy is born blind, deaf, and toothless.
16
The CIA once spent $20 million on a cat equipped with gear to spy on the Soviets, but it was hit by a taxi.
328