When cats are happy, they may squeeze their eyes shut.
10
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
A puppy is born blind, deaf, and toothless.
16
Cats and dogs can hear ultrasound.
350
Two dogs were among the Titanic survivors.
262
The reindeer is the only mammal that can see UV light.
17