One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Parrot parents "name" their children with a signature call.
112
The seahorse is the only fish to have a neck.
12
Sloths take two weeks to digest their food.
243
Cats and dogs can hear ultrasound.
350
The reindeer is the only mammal that can see UV light.
17
The Basenji dog is the only dog that is not able to bark.
4
When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
23