When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17