I've decided that there is five types of creatures in Ark: Mythical, Abberated, Mammal, Dinosaur, Mutated and Boss

Mythical includes creatures such as the Wyvern, Pheonix, and Unicorn. They are in different myths and appear in many fantasy books

Abberated creatures are like the bulbdog and nameless. They look weird and are kind of creepy. They also prefer to live in the dark

Mammals include the Otter and Equus, and are warm-blooded and when bred go through pregnancy, instead of laying eggs

Dinosaurs include the Rex and Raptor. They are cold blooded and have scales. They are also the basic animal of Ark. They can come as robots

Mutated creatures are what I call the creatures that are on Extinction, such as the Snow Owl. They are kind of like Abberated creatures but they do not live in caves

Bosses are some of the biggest creatures on the ark and killing them proves you as a warrior. They are accessed through various ways, the most common is at the obelisks and certain caves

-Jedi