An interesting evolutionary example:

What looks like the head of the Capitis Furtiva, more commonly known as the Wilyhead, is actually a brightly colored protuberance made of keratin, the very same substance that makes up a rhinoceros’ horn.

In a stunning example of predator camouflage, the animal’s actual head is suspended above it’s hindquarters at the end of its spine, giving it the aspect of a long tail with a bulbous knob at the end.

Beware this cunning animal–its head can strike suddenly, with the speed of a cobra, and its mouth holds rows of razor sharp and envenomed teeth.

You have been warned.