Certain frogs can be frozen solid, then thawed, and survive.
Cat’s urine glows under a black light.
A shark can detect one part of blood in 100 million parts of water.
A rat can last longer without water than a camel.
To escape the grip of a crocodile’s jaws, push your thumbs into its eyeballs – it will let you go instantly.
For the crocidile one, I’ve heard the same thing about sharks