America’s national bird is more beleaguered than previously believed, with nearly half of bald eagles tested across the U.S. showing signs of chronic lead exposure.
WASHINGTON — America’s national bird is more beleaguered than previously believed, with nearly half of bald eagles tested across the U.S. showing signs of chronic lead exposure, according to a study published Thursday.
“This is the first time for any wildlife species that we’ve been able to evaluate lead exposure and population level consequences at a continental scale,” said study co-author Todd Katzner, a wildlife biologist at U.S. Geological Survey in Boise, Idaho. “It’s sort of stunning that nearly 50% of them are getting repeatedly exposed to lead.”Lead is a neurotoxin that even in low doses impairs an eagle’s balance and stamina, reducing its ability to fly, hunt and reproduce.
“When we talk about recovery, it’s not really the end of the story — there are still threats to bald eagles,” said Krysten Schuler, a wildlife disease ecologist at Cornell University’s College of Veterinary Medicine, who was not involved in the study. During these months, eagles scavenge on carcasses and gut piles left by hunters, which are often riddled with shards of lead shot or bullet fragments.
The amount of lead exposure varies regionally, with highest levels found in the Central Flyway, the new study found.
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