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The bird appeared to be a bilateral gynandromorph: female on one side and male on the other.

"Many rearers of stick insects never see a gynandromorph," he said.

This possible gynandromorph northern cardinal is not the first to have been spotted in the area.

All serious butterfly collectors remember their first gynandromorph: a butterfly with a color and pattern that are distinctly male on one wing and female on the other.

But each gynandromorph’s genitalia is different from every other’s, Dr. Jahner said.