"At first Mr Hill wondered if the bird was leucistic - a term that means the specimen would have a loss of pigmentation in its feathers, but would not be half-female, half-male.<p>But after seeing mobile phone pictures, he suspected it had what is called bilateral gynandromorphism, which is when a bird would have both a functioning ovary and a functioning single testis."<p>So, uh, it would have been interesting if they had mentioned WHY the ornithologist thought it was gynandromorphic rather than leucistic? I'm not an ornithologist but it seems like a pigment mutation is a simpler explanation...