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  - WN.COM - Environment - 13/Aug 19:36

Why did a male bird lay an egg?

For wild birds, sex reversal may be more common than ornithologists originally believed. A new study of roughly 500 birds from five species found that up to six percent had the physical features of one biological sex, but the genetic make up of the other. In one instance, a genetically male kookaburra had a distended oviduct. The scientists’ only possible conclusion? The male bird had recently laid an egg. “This indicates that sex determination in wild birds is more fluid than we thought—and can persist into adulthood,” said Dominique Potvin, a behavioral ecologist, ornithologist, and evolutionary biologist from the University of the Sunshine Coast in Queensland, Australia....

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