When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The elephant brain weighs about 6,000g.
274
Only 3% of bird species have penises.
0
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2