Non-anthropogenic diet-based oiling of predatory birds - Katzner, Todd E.; Driscoll, Daniel; Jackman, Ronald; Bloom, Peter; Thomas, Scott; Cooper, Jeff; Livingstone, Stephen; Grubb, Teryl; Doyle, Jacqueline; Bell, Douglas; Didonato, Joseph; DeWoody, J. (Journal of Raptor Research, 2019)