Quote:
Wildlife experts believe there may have been 25,000 to as many as 75,000 nesting bald eagles in the lower 48 states when the bird was adopted as our national symbol in 1782. Since that time, the bald eagle has suffered from habitat destruction and degradation, illegal shooting, and contamination of its food source, most notably due to the pesticide DDT. By the early 1960s there were fewer than 450 bald eagle nesting pairs in the lower 48 states.
Chickened has it right. It wasn't that DDT was directly killing the birds at all. It was that it made the eggshells too thin to perpetuate the species. I am not advocating the use of DDT, but it's proven to not be quite as directly deadly as we once thought.
Wildlife experts believe there may have been 25,000 to as many as 75,000 nesting bald eagles in the lower 48 states when the bird was adopted as our national symbol in 1782. Since that time, the bald eagle has suffered from habitat destruction and degradation, illegal shooting, and contamination of its food source, most notably due to the pesticide DDT. By the early 1960s there were fewer than 450 bald eagle nesting pairs in the lower 48 states.
Chickened has it right. It wasn't that DDT was directly killing the birds at all. It was that it made the eggshells too thin to perpetuate the species. I am not advocating the use of DDT, but it's proven to not be quite as directly deadly as we once thought.