Rose-breasted Grosbeak Gynandropmorph
Detailed Description
The unique Rose-breasted Grosbeak pictured displays male characteristics on the bird’s right side and female characteristics are on the bird’s left side, a trait known as bilateral gynandromorphy. Male grosbeaks are dark black with a striking rosy breast and feathers under the wing (known as underwing coverts), while female grosbeaks are brown, with yellow/orange underwing coverts.
Sources/Usage
Photograph courtesy of Annie Lindsay | Powdermill Nature Reserve, Carnegie Museum of Natural History.