a rufous hummigbird selasphorus rufus drinks nectar from red coral bell flowers heuchera in an urban backyard

adaptation alpestris animal avian backyard bell biology bird birding birds birdwatching change climate closeup colorado conservation coral drinks ecology environment eremophila extinction feeder flowers gases global greenhouse habitat heuchera hummigbird hummingbird indicator migration modeling natural nature nectar ornithology outside perched red richness rufous rufus science selasphorus species temperatures threatened urban warmdwelling warming wild wildlife