A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Cats and dogs can hear ultrasound.
350
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
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
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8