Cats sleep for 70% of their lives.
8
Nicole Kidman is scared of butterflies.
65
Only 3% of bird species have penises.
0
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12