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Lauren E. Walker holding a banded raven (Credit: Lauren Walker, USGS. Public domain.)

United statesLauren walkerYellowstone national parkNational park serviceBird banding laboratoryUniversity of washingtonYellowstone bird programJournal of raptor researchBird banding labWildlife biologistYellowstone birdMonitoring avian productivityBlack capped vireoRaptor researchCommon ravensReintroduced gray