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Females sex with animals

You've probably heard about duck penises—that they're shaped like corkscrews, and that females have vaginas that corkscrew in the opposite. One of these habits is the females' favorite pastime: sex with each other. Why is Bonobos are a now endangered species of great ape.

Females sex with animals

those species where males do not contribute material benefits to the females or "where the male invests little or nothing beyond his sex cells, the female has. To study these differences, scientists observe mating systems and describe how males and females come together. When choosing mates, animals evolve.