Natural selection has dictated that some birds must become proficient in camouflage in order to avoid predation and stay alive. Observe the willow ptarmigan (cited below). When sitting close to her nest, the female ptarmigan blends almost perfectly with the surrounding tundra.
Birds can also use camouflage to hide not themselves, but their nests. The sitella makes a good example of this use of camouflage. This Australian bird covers the outsides of its nests with rough material (often bark or lichen) that blends in with the nests’ nearby trees.
Additional citation: http://www.babelgum.com/135798/attenboroughs-life-birds-camouflage-nests.html
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