The elephant brain weighs about 6,000g.
274
Dogs sometimes fake being sick to get attention.
26
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Lobsters have blue blood.
476