The cat brain weighs about 30g.
167
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
There are approximately three chickens for every human on Earth.
13
Only 3% of bird species have penises.
0
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6