vesper sparrow pooecetes gramineus perched on a wire fence on the plains

adaptation alpestris animal anthropogenic avian biology bird birding birds birdwatching carbon change climate climatic closeup colorado conservation conservatism dwelling ecology emissions environment eremophila extinction fence gases global gramineus greenhouse habitat indicator microevolution migration natural nature niche ornithology outside perched phenology plains pooecetes richness science sparrow species temperatures threatened vesper warm warming wild wildlife wire