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Competition and climate change combine to threaten Bicknell's thrush


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Bicknell's Thrush (Catharus bicknelli) is a songbird that breeds in New England mountaintop forests threatened by climate change. Research forthcoming in The Condor: Ornithological Applications shows that this threat could be exacerbated by competition from related birds living downslope. Climate change may cause Bicknell's Thrushes' preferred habitat of spruce-fir forests to shift to even higher elevations, constricting their range, and new data suggests that aggression from related Swainson's Thrushes (Catharus ustulatus) could drive them uphill even faster.


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