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Some species of birds turn to living mammals as a source of building material for their nests. The process of stealing hair is called kleptotrichy, and birds will test their ability to pluck hair from various mammals. In this vid, a black-crested titmouse

Some species of birds turn to living mammals as a source of building material for their nests. The process of stealing hair is called kleptotrichy, and birds will test their ability to pluck hair from various mammals. In this vid, a black-crested titmouse