When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Condoms were originally made of animal intestines or linen.
347
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
Lobsters have blue blood.
476