Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Bats sleep 18-20 hours per day.
5
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Parrot parents "name" their children with a signature call.
112
The colossal squid has the largest eyes in the world.
4
In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
22