The Basenji dog is the only dog that is not able to bark.
4
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Sloths take two weeks to digest their food.
243
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
A puppy is born blind, deaf, and toothless.
16
Condoms were originally made of animal intestines or linen.
347