Nature's Nether Regions: What the Sex Lives of Bugs, Birds, and Beasts Tell Us AboutEvolution, Biodiversity, and Ourselves by Menno Schilthuizen

Author:Menno Schilthuizen [Schilthuizen, Menno]
Language: eng
Format: epub
Publisher: Penguin Group US
Published: 2014-05-01T00:00:00+00:00

Resisting rape. The clockwise-coiled vagina of a female mallard duck (A) blocks entry by the counterclockwise penis (B), unless the female relaxes her vaginal muscles.

Not Harpactea sadistica. When a male of this species encounters a female, the pair adopts a mating position in which the male cradles the female, belly up, in his four long front legs, and then, with surgical precision, holding one pedipalp steady with the other, pierces the female’s abdominal skin and injects his sperm straight into her body cavity. Not content with a single jab, he then zigzags down her tummy, creating a double row of six to eight neat punctures, changing pedipalps each time as he shifts from left to right. The female, whose sperm storage organs are rudimentary, has her eggs fertilized by these sperm, which swim straight through her body to reach the eggs in her ovaries.

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