When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Sharks have been on the planet longer than trees.
14
Sloths take two weeks to digest their food.
243
The elephant shrew’s closest relative isn’t a shrew — it’s actually an elephant
9
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
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
The Basenji dog is the only dog that is not able to bark.
4