While humans have been harming bald eagles for hundreds of years by destroying habitat and killing their prey, the most recent cause of bald eagle decline was the pesticide DDT. DDT, now banned, ended up in the eagles’ tissues through eating smaller animals that were also infected. The pesticide caused the eagle egg shells to be very thin, which often resulted in crushing during incubation. When they weren’t crushed, many would not hatch anyways due to the poison.
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