When dragonflies mate, their tails form a love heart.
22
When cats are happy, they may squeeze their eyes shut.
10
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
By putting a frog in a bucket of milk, scientists following up on an ancient Russian way of keeping milk from going sour have identified a wealth of new antibiotic substances.
9
Cows can sleep standing up, but they can only dream lying down.
745
The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13