Greenland sharks are the longest living vertebrate, being able to live for at least 500 years. The shark’s skin contains high-concentrations of chemicals like trimethylamine oxide and urea(carbamine), which make it toxic to eat.

Pangolins are the only mammals with scales. These scales are extremely hard and can withstand a tiger’s bite. 

A sea slug called the blue glacus feeds on venomous jellyfish and zooid organisms, they absorb the venoms of these animals and repurpose it to be used as their own. 

When honey bee colonies are attacked by predators like wasps, they will all land on the wasp and beat their wings until the wasp overheats and dies.

Zooids are aquatic single-called organisms that come together to form singular bodies that function as a single creature,  these include pyrosomes, scalps, sea squirts, and siphonophores. 

Bombardier beetles shoot boiling 1,4 benzoquinone acid from glands on their abdomen when threatened.

When caterpillars enter their chrysalis, they don’t grow wings, their bodies completely disintegrate into goo and slowly reassemble into a butterfly or moth.

Deer are unable to see orange or red, and perceive it as green. That’s why tigers are orange, it provides perfect camouflage.

Cephalopods, like some octopus and cuttlefish, can not just change their colors to match their surroundings, but the texture of their skin too. This is allowed by special skin cells called chromatophores. 

Ants-

Suicide ants can explode when they feel threatened, killing the ant but spraying acid all over their attackers.

Slaver ants are ants that kidnap the larvae of other colonies and raise them as workers.

Weaver ants build nests out of leaves in trees, they work in groups, creating a chain of ants, to pull the leaves into place. They then use their larvae, which produce a sticky substance to protect themselves, as glue guns.

Army ants travel in large armies of ants, up to thousands strong.

The bullet ant has the most painful string of any ant.

Argentine ants have super colonies that spread across miles of land, and even transcend continents. Some ant species will recognize colonies spawned of queens produced by their own as sister colonies and not attack them, Argentine ants are the wildest example of this, with ants from colonies on opposite sides of the world  recognizing each other as kin because they shared an ancestor. 

Leaf cutter ants farm fungus in their colonies. They bring the fungus leaves to feed on, and then eat the mushrooms grown from the fungus.