The World's Most Bizarre Critters!Self-described "naturalist" and host of Science Channel's Weird Creatures, Nick Baker shares his favorite weird animals with PEOPLEPets.com

MIMIC OCTOPUS

This critter "uses its incredible muscular control to push its bodies into different shapes," explains Baker. "It can be a flat fish, it can be an eel, it can be a jelly fish." Never trust a shape-shifter!