The chemical caused eagles’ eggs to thin and break under light pressure.
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Despite being the symbol of the nation, the American people did not do much to protect bald eagles.
By the 1970s, the bald eagle was on the brink of extirpation (local extinction) in the United States because of over hunting and pesticide use by humans.
When the newly formed United States set out to create a national seal in the late 18th century, a committee of emblem designers sought to find an animal that represented strength, agility, and dominance.