Nearly half of U.S. bald eagles suffer lead poisoning
CTV
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.
While the bald eagle population has rebounded from the brink of extinction since the U.S. banned the pesticide DDT in 1972, harmful levels of toxic lead were found in the bones of 46% of bald eagles sampled in 38 states from California to Florida, researchers reported in the journal Science.
Similar rates of lead exposure were found in golden eagles, which scientists say means the raptors likely consumed carrion or prey contaminated by lead from ammunition or fishing tackle.
The blood, bones, feathers and liver tissue of 1,210 eagles sampled from 2010 to 2018 were examined to assess chronic and acute lead exposure.
"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."
