The osprey was once considered an endangered species in the 1950's and 1960's due to habitat alteration and use of the pesticide DDT (dichlorodiphenyltrichloroethane). Osprey nesting platforms were implemented as a solution to help restore populations in Pennsylvania. The osprey population is thriving today because of this technique and the banning of DDT. It is now considered a species of least concern on the International Union for Conservation of Nature's list of threatened species.
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