Today I saw ten eagles on the beach on the shore of Lake Michigan.
Through the efforts of people who worked to ban DDT, the eagle has returned to the shores of the Great Lakes. We nearly lost the eagle, the peregrine falcon and the osprey, due to economic poisons that magnified in food pyramids. This was an unintended consequence of widepread spraying for insects. Once the widespread spraying stopped, the lakes began to purge the poisons. But this took many years. Read about the return of the American bald eagle in The Dynamic Great Lakes.