Any sort of animal like mammals, fish, dinosaur, lion, bugs, cockroach etc.... 
Mine is : Snake because they are dangerous and mysterious 
A Cat (any form of cat, whether it be a house cat or a wild cat in the wilderness) ... Reason being, felines are quick in regards to speed. They are self-sufficient (hunting for their own food), know how to blend into their surroundings (to hide or ambush prey), and can defend themselves if push comes to shove.
