Camouflage is a sort of adaptive technique-mostly inbuilt- by animals ,birds, reptiles etc to deceive their enemies or preys. They adapt and merge with the surrounding environmental factors so that the enemies or preys do not identify them making it easy for them to escape from enemies or to pounce upon their prey.
Their habitat habits, skin colour, movement, odour, sound etc emanating from them- one or more of these are used to camouflage themselves.
For many animals their skin colour can be adapted to be as like as the surrounding soils, bushes, leaves etc. They merge so well that it is not easy to identify them from the environment.
The most common example is the common Chameleon. It is known to change the colour so that it takes the colour of the surroundings it stays put in waiting.
There are certain insects, one moth-like the common cricket - which so nicely merges with the stem skin of trees so much so that even we cannot distinguish it from the tree skin.
Green hopper- This is a very common insect seen in our surrounding gardens and fields. Its colour is green and it merges so easily with the green leaves in the garden and fields. It can also camouflage itself sticking to thin shoots of plants and bushes.
Other hoppers- Just like the Green hoper, there are other hoppers which camouflage themselves and stick or hand to tree branches or dried shoots.
Butterflies- There are various butterflies which have adaptive camouflage ability. They get merged with certain colours of flowers which are same as their wings. They also rest and breed in such places where they get camouflaged like tree barks, tree skins, behind leaves dry or raw etc.
Wild animals: Wild animals are bestowed with soft paws which help it avoid sounds when moving. Sometimes even Elephant uses this camouflage technical to hide themselves from disturbance or closely watch enemies and poachers. Leopards and other animals in the cat family have the ability to camouflage by hiding or resting or waiting on tree branches or bushes or ground which have close proximity to their skin colour and pattern
Squirrels, Parrots, sparrow, wood pecker birds and many other birds and lower animal have such adaptive camouflage ability. Some birds can use their wing and feathers for camouflage effects.
While it is naturally given facility i all these animals, birds, insects and other creatures, even humans used camouflage to protect himself from the wild animals and also for hunting prey. In modern times camouflage dresses are used by armed forces to merge with the terrain and escape from enemy observation binoculars, telescopes and even from satellite spying.