Wednesday, October 19, 2011

The Male Bird Spider Back Massage

When a man of golden orb-weaver spider Nephila Pilip want to get to work, he takes a special trick: You give your partner a "backrub", a new study.

For many spiders, the females of the species are much larger than the males-N. Pilip women are up to ten times larger, so mating is always a risky business. An unlucky suitor may be interrupted in his carnal embrace, when a woman starts and eats it.

Male spiders have developed several techniques to avoid this fate, at least before the end of the work.

Black widow, for example, picking up the scent of women that help determine how hungry males of their interests before trying to love is to mate. Redback spiders in Australia, meanwhile, actually snacked leave to extend their time with a woman.

N. Pilip strategy involves another trait common among spiders: pedipalps, a pair of appendices that include the male genitalia, said study co-author Matjaz Kuntner, Smithsonian National Museum of Natural History and the Slovenian Academy of Sciences and Arts.

Male pedipalps fit perfectly into two of the female genital openings, which can leave behind to "connect" openings. But a man needs to mate several times to connect the two openings and ensure the woman who may have multiple partners-have their babies.

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