an immature chestnut-collared longspur calcarius ornatus perched on barbed wire on the pawnee national grasslands

adaptation animal avian barbed biology bird birding birds birdwatching calcarius carbon change chestnutcollared climate climatic closeup colorado conservation distribution ecology environment extinction gases global grasslands greenhouse habitat hunting immature indicator insects longspur microevolution migration migratory national natural nature near niche ornatus ornithology outside pawnee perched richness science species temperatures threatened tourism warmdwelling warming wild wildlife wire