Biologist Bracken Brown couldn’t believe his eyes when he spotted the seemingly out-of-place bird soaring through the sky. “I always enjoy doing roost counts, watching a column of vultures catch ...

The white-backed vulture (Gyps africanus) is an Old World vulture, as its habitat does not extend into the New World or the western hemisphere. This large bird is native to the open plains and ...

Every summer and early fall, Mary Larson Bishop begins scanning the skies over her Sierra Foothills home outside Fresno, California. Bishop, who's 85, keeps track of when the big dark-brown birds with ...