A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The cat brain weighs about 30g.
167
Bats sleep 18-20 hours per day.
5
Ants have tiny magnetic compasses in their antennae which help them navigate.
9