When cats are happy, they may squeeze their eyes shut.
10
The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23