Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Cats recognise the voice of their owner, but never evolved to care.
22
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
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
Dogs sometimes fake being sick to get attention.
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