The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The cat brain weighs about 30g.
167
There's a rare breed of pig that looks like a sheep.
14
When the "Elephant Whisperer" Lawrence Anthony died, a whole herd of elephants arrived at his house to mourn him.
25
Travis was a chimpanzee who socialized with humans since birth. He could log onto a computer to look at pictures, watch TV using a remote control, brush his teeth, feed hay to his owner's horses, water plants, and learned the schedule of passing ice cream trucks.
11
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23