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Cheep thrills

发布时间:2019-03-08 03:14:12来源:未知点击:

By Jon Copley BIRDS with false penises use them exclusively to achieve orgasm, leaving the business of ejaculation to other body parts, say biologists in Britain. Penises are rare in the avian world. Buffalo weaver birds are endowed with a phalloid organ, but while it looks like a penis, it doesn’t have a duct so can’t transfer sperm. To find out what it did, Tim Birkhead of the University of Sheffield and his colleagues used a stuffed female bird, complete with artificial cloaca, to seduce male red-billed buffalo weavers, Bubalornis niger. Bouts of mounting the stuffed bird lasted for nearly half an hour, and at the end the males appeared to climax. Clenching hold of the female model, their leg muscles went into spasm, their entire bodies shook and their wings quivered. The researchers believe stimulation of the organ—and orgasm—may be necessary to trigger ejaculation. Indeed, when the researchers rubbed the organs of three males immediately after each had inseminated a live female, the birds ejaculated again (Nature, vol 399, p 28). Why the birds evolved their unusual mating equipment is still not clear. “The most plausible explanation is that by stimulating both himself and the female, the male increases his chances that the female will retain his sperm,