“Demographic Implications of Lead Poisoning for Eagles Across North America,” was published in the journal Science. Led by scientists from the U.S. Geological Survey, Conservation Science Global, Inc., and U.S. Fish and Wildlife Service, researchers evaluated lead exposure in bald and golden eagles from 2010 to 2018.  

In this study, almost 50 percent of the birds sampled showed evidence of repeated exposure to lead.

https://www.usgs.gov/news/national-news-release/groundbreaking-study-finds-widespread-lead-poisoning-bald-and-golden