Question

How has DDT caused decline in bird population?

Answer 1

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Here's your Answer...

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DDT caused decline in bird population as it makes the egg thinner and kill the embryo.
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Answer 2

Shell-thinning caused lesser declines in populations of Golden and Bald Eagles and White Pelicans, among others. Similar declines took place in the British Isles. Fortunately, the cause of the breeding failures was identified in time, and the use of DDT was banned almost totally in the United States in 1972.