Analysis of 50 years’ bird droppings inside a large decommissioned chimney on a university campus, provided evidence that DDT and bird diet may have played a role, in a long-term decline for populations of insect-eating birds in North America.
Analysis of 50 years’ bird droppings inside a large decommissioned chimney on a university campus, provided evidence that DDT and bird diet may have played a role, in a long-term decline for populations of insect-eating birds in North America.