Shirley and Jeffrey Caldwell are avid bird watchers in Erie, Pennsylvania. But they’ve never seen anything like the bird that started visiting their home a few weeks ago.
The bird is half-red, half-taupe—its colors split right down the middle.
According to National Geographic, the bird is a bilateral gynandromorph, which means half its body is male and half is female.
According to Daniel Hooper, a postdoctoral fellow at the Cornell Lab of Ornithology, it likely happens in all species of birds, but it’s only noticeable when the male and female look distinct from each other.