All animals are designed to blend with their natural environment...........some to hide from their pray some to hide from their predators..........just the way of things.........brought about by natural selection. The ones that hide best live to breed ..........
It will be quicker to ask which DON'T have camouflage. Poisenous and stinky (skunk) animals don't need to hide and are often brightly coloured to advertise the fact that they are not tasty. Some harmless animals take advantage of this and have evolved to look a lot like the dangerous ones, and so fool predators.