The birds ingest contaminated fish and seabirds which poisons the adults and weakens their eggs .
In the 1950s , bald eagles and peregrine falcons on the Channel Islands became locally extinct after widespread use of pesticides such as DDT .
The birds ingest contaminated fish and seabirds which poisons the adults and weakens Channel Islands ' eggs .
In the 1950s , bald eagles and peregrine falcons on the Channel Islands became locally extinct after widespread use of pesticides such as DDT .