Dogs sometimes fake being sick to get attention.
26
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Squirrels forget where they hide about half of their nuts.
698
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
Condoms were originally made of animal intestines or linen.
347
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19