The bald eagle, a national symbol of strength and resiliency, may be a common sight today, but just a few decades ago toxic pollutants working their way up the food chain had the species toeing the line of extinction. Prevalent use of dichloro-diphenyl-trichloroethane (DDT), a harmful insecticide, on agricultural fields caused eagles to produce eggs that were too delicate to support the incubating bird, lowering hatch rates in a drastic way. The decline was so severe that by DDT’s ban in 1972, only 482 breeding pairs were left throughout the entire continental United States.
Following the ban, one nesting pair of bald eagles remained in the state of New York, and their eggs were too contaminated with chemicals to be considered a viable means of repopulation. Restoration efforts began across the nation, but two researchers in particular, Peter Nye from the New York Department of Environmental Conservation (DEC) and Tom Cade of Cornell University put New York on the map as a key player in eagle repopulation tactics. They took to using an ancient falconry practice called hacking to raise eaglets in a controlled, but wild, environment, to ensure that the birds would learn the proper survival techniques to independently prosper after fledging the nest.
“Their goal was to establish 12 nesting pairs in New York. By 1988, they had achieved the goal of 12 nesting pairs, and here we are in 2015 with more than 300. I know down in Maryland in the Chesapeake Bay area there are even more, so the reintroduction has been very successful,” said Michael Clark, Senior Wildlife Biologist for New York DEC. Clark and his colleague Scott Van Arsdale, Wildlife Technician for New York DEC, were mentored by Nye, and have taken over the legwork of tagging and monitoring the birds since Nye’s retirement.
To view more photos, visit the Chesapeake Bay Program’s Flickr page.
Images by Will Parson
Text by Jenna Valente