kqedscience:

This bird might look like a holiday ornament, but it is actually a rare half-female, half-male northern cardinal

“Researchers have long known such split-sex “gynandromorphs” exist in insects, crustaceans, and birds. But scientists rarely get to extensively study a gynandromorph in the wild; most published observations cover just a day or so. Observers got to follow this bird, however, for more than 40 days between December 2008 and March 2010.”

Learn more at Science.