forster`s tern sterna forsteri flying against a cloudy blue sky

adaptation alpestris animal anthropogenic avian biology bird birding birds birdwatching carbon change climate climatic closeup cloudy colorado conservation conservatism distribution ecology emissions environment eremophila extinction flying forster forsteri gases global greenhouse habitat indicator microevolution migration natural nature niche ornithology outside perched richness science sky species sterna temperatures tern threatened tourism warmdwelling warming wild wildlife