As one of the most popular birds in America, it's easy to see why birdwatchers love their brilliant red plumage.

Researchers believe that the cardinal frequenting the Caldwells’ bird feeder in Erie, Pennsylvania, is a rare bilateral gynandromorph, half male and half female. Not much is known about the unusual ...

Tropical Audubon president José Francisco Barros says only about three such sightings are reported in the country each year.