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
There are approximately three chickens for every human on Earth.
13
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
The octopus does not have a blind spot.
273
Jellyfish as a species are actually older than dinosaurs and sharks.
383
In the movie 'The Wizard Of Oz', Toto the dog's salary was $125 a week, while Judy Garland’s was $500 a week.
5