A new study has found that nearly half of all bald and golden eagles in the USA suffer from chronic and/or acute lead poisoning, which the research team believes is the result of these birds scavenging the remains of animals shot with lead bullets.
The study evaluated signs of lead exposure in a total of 1,210 bald and golden eagles from 38 states across America, taking blood samples from live eagles, and examining bone, livers and feathers from dead birds.
Of 448 birds whose bone samples were analyzed using plasma mass spectrometry, 47 percent of bald eagles and 46 percent of golden eagles were found to have bone lead concentrations over the clinical thresholds for chronic lead poisoning, indicating repeated exposure to lead over a long term. Rates appeared to rise with age.
Furthermore, there was evidence of acute lead poisoning as well – suggesting a recent, short-term, high-exposure event – in nearly a third of bald eagles and around 7-9 percent of golden eagles. In some cases – 25.8 percent of bald eagles and 4.9 percent of golden eagles – lead concentrations in the liver were high enough to hit very conservatively set thresholds above which lead poisoning is “generally determined to be the cause of death.”
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