In 1973, Congress passed the Endangered Species Act, and the bald eagle was listed as an endangered species (Wolfe and Bruning, 1997). The 1940 Bald Eagle Protection Act prohibited commercial trapping and killing of bald and golden eagles, and more significantly, DDT was banned in 1972 when it was proven that the pesticide interfered with the eagle’s calcium metabolism, causing either sterility or unhealthy eggs with brittle shells (Wikipedia. Due to a variety of factors, including use of the pesticide DDT, by the 1950's bald eagles were nearly extinct in the contiguous United States. Its range stretches from northern Mexico to Canada and Alaska and covers all of the continental United States (Wikipedia. The bald eagle ( Haliaeetus leucocephalus) is only found in North America.
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