MARBLE CANYON, Ariz. — Nestled among Arizona’s colossal Vermilion Cliffs, an inconspicuous building bustles with the sounds of flapping wings. Inside the remote building, no larger than a double wide ...

Arizona’s desert birds are in decline, according to a national conservation report tracking long-term bird populations, prompting one conservation group to ask the federal government to take action on ...

Birds that call Arizona's desert ecosystem home — including the state's iconic cactus wren — are in serious decline, according to a sweeping new conservation report. Why it matters: Birds are ...

Biologists from the Arizona Game and Fish Department checked the health of bald eagle nestlings near Lake Pleasant, fitting them with leg bands to track the birds. Bald eagle populations dwindled in ...

Arctic seals are being pushed closer to extinction by climate change and more than half of bird species around the world are declining under pressure from deforestation and agricultural expansion, ...

Climate change and habitat loss could cause more than 500 bird species to go extinct in the next 100 years, researchers from the University of Reading have found. Their study, published in Nature ...

A superb fairy-wren calls to a Horsfield's bronze-cuckoo. Brood parasites like cuckoos lay eggs in other birds' nests and leave them behind for the host birds to raise. David Ongley / Cornell Lab of ...

Biologists treat sick and injured condors in a remote "hospital" in northern Arizona. The birds also receive vaccines to fight the avian flu. The condors ingest lead ammunition when they eat animal ...