© USF&WS
"Conservancy and other scientists agree that migratory songbirds can act as the proverbial canary in the coalmine, because their wellbeing is indicative of the overall, long-term health of forests and other ecosystems. Populations of wood and Bicknell’s thrushes are in decline across their range in the Northeast and Canada. It is unclear yet if mercury is to blame."
Link: Full Article from The Nature Conservancy
