In the animal world, they live by the laws of survival. The strong survive. Animals have many different defense mechanisms that can protect them against predators or gain them an evening meal. Some methods of defense are passive, using disguises and deceit to fool its enemy into retreat. One method used in this type of defense is camouflage.
Some animals can change their own coloring to match their surroundings.
Others are born with the coloring that will allow them to blend into their native surroundings. The white coat of the arctic fox and the polar bear provide excellent cover against the white snow of its homeland. In comparison, the bright green color of the tree frog help it to blend in with brightly colored leaves. Another passive method of defense ,used by the cuttle fish and the squid is called ejection. By using the ejection method, these animals eject a black inky fluid, in which it can hide from its predators.