Thankfully, ospreys are making a comeback after becoming nearly wiped out in the 1960s and 70s due to DDT poisoning. Until the toxin was banned, their fish prey ingested DDT run off from fields and lawns, which then affected ospreys by causing the birds' shells to become so thin that their eggs were crushed under the parents' weight.  Now there are active osprey nests in large trees and on man-made platforms all along inlets and marshy coastlines here in Connecticut and elsewhere. The adults begin repairing or building the nests in the spring and stay with them well through July.  Attentive parents, they issue high-pitched calls to each other as they come and go. They are strong "sea eagles", exuding power even while waiting patiently for a mate to return to the nest or while shading the young from strong summer sun.