Cats recognise the voice of their owner, but never evolved to care.
22
Gorillas can catch human colds and other illnesses.
205
In 2005, in Africa, it was reported that three lions rescued a 12-year-old girl from kidnappers and guarded her for half a day until help came.
46
Cats sleep for 70% of their lives.
8
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23