an adult hermit thrush catharus guttatus perched on a tree limb during migration

adaptation adult animal avian biology bird birding birds birdwatching carbon catharus change climate climatic closeup colorado conservation conservatism distribution ecology emissions environment extinction gases global greenhouse guttatus habitat hermit hunting indicator insects microevolution migration migratory modeling natural nature niche ornithology outside perched richness science species temperatures threatened thrush tourism tree warmdwelling warming wild wildlife