This is an illustration of warbler. For decades, conservationists have considered blue-winged warblers to be a threat to golden-winged warblers, a species being considered for federal Endangered Species protection. Blue-winged warbler populations have declined 66 percent since 1968, according to the North American Breeding Bird Survey.

Often described as the blueprint of life, DNA contains the instructions for making every living thing from a human to a house fly.