an unusual cardinal has appeared, displaying both male and female traits. Scientists say it may be a so-called gynandromorph. By Karen Weintraub A bird hopping outside the window lately is the ...

“Theoretically, this bird could either mate with a normal male cardinal and lay fertile eggs, or it could mate with a normal female cardinal and father her eggs!” Northern cardinals are widely ...

Here’s how it works. Male cardinals are red. Female cardinals are tan. The odd bird that's been roosting outside Jeff and Shirley Caldwell's kitchen in Erie, Pennsylvania, is an even split of both.

Jeffrey and Shirley Caldwell have been attracting birds ... male, half female with colors split down the middle and this half-orange, half-brown lobster.) Part of what makes this particular ...

Gynandromorphs have been found among insects, birds, and even chickens, but can’t always be spotted. Because male and female cardinals look markedly different, the gynandromorphs among them can ...

The cardinal pictured ... formation of either male or female gonads, which then release hormones during early developmental stages that direct the sex of other cells. Birds, on the other hand ...

"It was one of the experiences of a lifetime," Hill said about the bird that was bright red like a male cardinal on one side and brownish white like a female on the other. Known as a bilateral ...