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Wasn't as heavily used after the mid '80s is because they found out it was one of the leading causes of the bald eagle decline and found this by looking at egg shells from the early 1900s and comparing them to egg shells in the 1980s and they found out that ddt actually resonates in these egg shells and makes them thinner. therefore, there's less survival rate of their chicks. >> that's an excellent answer. >> so these are my volunteers and interns. they give me their free time. >> yeah. >> and i put them through hell. >> every day. >> both squirrels, position of surprise. >> this is a female ...

Mid 1980s and the reason why it wasn't as heavily used after the mid '80s is because they found out it was one of the leading causes of the bald eagle decline and found this by looking at egg shells from the early 1900s and comparing them to egg shells in the 1980s and they found out that ddt actually resonates in these egg shells and makes them thinner. therefore, there's less survival rate of their chicks. >> that's an excellent answer. >> so these are my volunteers and interns. they give me their free time. >> yeah. >> and i put them through hell. >> every day. >> both squirrels, position o...