科学家发现了一种罕见的半雄性, 半母鸣禽

可能不是百万分之一, but it’s pretty close.

研究人员发现了一种稀有的鸣鸟,它的身体一侧是雄性, 和女性在另一边.
它的 being described 有一个 “千载难逢的” 发现.
The last time the Powdermill Nature Reserve at the Carnegie Museum of Natural History found another was 15 几年前, and it’s only the fifth to be discovered out of the nearly 800,000 birds that the nature reserve has seen.
    Everyone here, I mean the whole crew, was just so excited,” Annie Lindsay, the nature reserve’s bird banding program manager, 告诉CNN. “There was this scientific interest, 当然. But also happiness for seeing something that was so rare.
    This songbird is the fifth half-male, half-female bird to be discovered by the nature reserve.

    What happens to a bird like this

    The bird was identified as a Rose-breasted Grosbeak. Male and female Grosbeaks are distinguished by their color: males have pinkwing pits,” while females are yellow-brown.
    The sides of this bird’s body were different colors.
    This genetic variation is known as gynandromorphism (“gyneis Greek for female; “andromeans male, 和 “morphmeans variety).
    Due to its rarity, scientists don’t know much about how gynandromorphism affects the bird’s life.
    There probably aren’t any advantages to it,” Lindsay said. “It will definitely impact its ability to mate. We don’t know if that female side has a functional ovary. If it does, and it is able to attract a male mate, it could reproduce.

    How it was found

    Since the discovery wasn’t made during breeding season, the songbird wasn’t displaying any behavioral cues that could help answer some of these questions. The reserve found the bird during normal birdbanding” 运作 — this is when caught birds are marked with a miniature aluminum leg band with a nine digit identification code before being released again.
    What is certain is that the bird was at least a year old, meaning that it was able to survive to adulthood with its condition.

    How something like this can happen

    Gynandromorphy isn’t uncommon. 它 occurs in species of spiders, crustaceans and even chickens.
    It’s the result of a genetic error when an unfertilized egg with two nuclei. fuses with sperm, and produces an embryo with both male and female cells. Here’s a good explainer on how it happens.
      Lindsay was able to take feather samples of this songbird, which the nature reserve plans to use for a genetic analysis to see what else they can find out about it.
      More information can be found about this songbird on the nature reserve’s 网站.

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