"Once common across North America, by the 1950s bald eagle populations had plummeted to an estimated 412 nesting pairs in the United States. Their decline was attributed to several factors, including use of the pesticide DDT, which caused thinning in their eggshells and interfered with reproduction. New regulations, including a ban on DDT, helped the species rebound. In 2007 the bald eagle was officially removed from the list of endangered and threatened species, marking the end of a long recovery. It continues to be protected by the Bald and Golden Eagle Protection Act."
