A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
The cat brain weighs about 30g.
167
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5