One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Lobsters have blue blood.
476
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
Gorillas can catch human colds and other illnesses.
205
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217