If you enjoy watching cardinals or bluebirds at a feeder or seeing a great blue heron at the water’s edge, it may not be immediately apparent but the nation’s birds are under siege. 

“Birds are declining,” said Ken Rosenberg, a conservation biologist with Road to Recovery, an organization that focuses on recovery of the nation’s most rapidly declining birds. “It’s death by a million cuts.”

They’re imperiled by habitat loss, disease and other threats. Several incidents this spring illustrate a few of the hazards.

In northern Arizona, at least 13 endangered California condors died after being infected by avian flu, and federal officials just approved an emergency vaccine.

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