This Northern Cardinal (Cardinalis cardinalis) has female plumage on its right, and male plumage on its left, a condition known as bilateral gynandromorph. Halfsider Northern Cardinal in Rock Island, IL. Image credit: Brian Peer / Robert Motz. Bilateral gynandromorphy is a condition in which one half of a bird’s body appears as a female and the opposite half appears as a male. Often, the left side is female and the right side is male. This condition...
