Endangered peregrine falcons, such as those now raising a new brood of young on the 33rd-floor ledge of the USF&G building in Baltimore, have made such a strong comeback they now may pose a threat to some other endangered birds.
"In the mid-Atlantic region, there are probably more peregrines than there ever were," said John Barber, a USF&G employee and former Smithsonian Institution ornithologist.
Peregrines nesting on special towers erected on Assateague and Chincoteague islands on the Eastern Shore have become a particular problem.
The falcons are preying on endangered least plovers and piping plovers on Maryland's Assateague Island, Barber said.
"The solution, I think, is to . . . relocate the peregrines by taking down the towers they're nesting on, and that's very controversial," he said.