Bicknell's thrush (Catharus bicknelli) is a medium-sized, migratory thrush that depends on high elevation, spruce-fir forests to breed. Long-term surveys of Bicknell's thrush suggest that populations of this species are sharply declining throughout its range. Among factors that may be contributing to this decline are airborne pollutants that damage high-elevation forest ecosystems and warming temperatures as a result of climate change. Monitoring populations of Bicknell's thrush can provide valuable insight into the ways in which climate change and other forms of ecological degradation are impacting not only this species but also the high-elevation forests upon which they depend.