Sex with chimps

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Though chimpanzees and humans share about 99 percent of the same DNA, numerous physical and behavioral traits separate us from our closest living relatives. But are we different even when it comes to sex? Just how do chimpanzees "do it?

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The Evolution of Bruno Littlemore is a novel that is narrated by a superintelligent chimpanzee. Either that sentence made you roll your eyes or it made you excited to read the book ; there's probably not a middle ground. Though I generally despise books written from the perspective of animals, I gave Bruno some leeway because of the low key science fiction trappings.

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All rights reserved. Although chimps are found in 21 African nations, conservationists rank them as endangered. Female chimps mate promiscuously so that many males think they might be a baby's father; that discourages infanticide.

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By Colin Barras. Humans, meanwhile, show a variety of mating behaviours but often form monogamous couples. Michael Jensen-Seaman and Scott Hergenrother at Duquesne University in Pennsylvania think that it is the chimps — not humans — that have experimented with new sexual behaviours since our lineages diverged. But did male chimps inherit their mating plugs from the last common ancestor they shared with us or did they evolve it later?

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Bonobos and chimpanzees diverged from each other around 2 million years ago and differ in morphology, behavior, and perhaps even emotions and cognition in important ways. Bonobos are female dominant, with females forming tight bonds against males through same-sex socio-sexual contact that is thought to limit aggression. In the wild, they have not been seen to cooperatively hunt, use tools, or exhibit lethal aggression.

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They believe that the chimpanzee version of the immunodeficiency virus called simian immunodeficiency virus or SIV most likely was transmitted to humans and mutated into HIV when humans hunted these chimpanzees for meat and came into contact with their infected blood. Over decades, the virus slowly spread across Africa and later into other parts of the world. The earliest known case of infection with HIV-1 in a human was detected in a blood sample collected in from a man in Kinshasa, Democratic Republic of the Congo.

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Our early ancestors interbred with chimpanzees after the two species drew apart millions of years ago, a new paper suggests. The provocative idea is sketched by US genome experts, who have discovered that hominids and chimps diverged far more recently, and over a much longer timescale, than anyone had thought. During this time, the authors theorise, the two primates were rather more than kissing cousins: they had sex, swapping genes before making a final separation.

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Humans have a much longer and wider penis than the other great apes. Even the largest of gorillas, more than twice as heavy as a human, will have a penis just two and half inches long when erect. However our testicles are rather small. The relative size of our penis and testes is all down to our mating strategies, and can provide some surprising insights into early human culture.

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Observing a troop in Gombe, Tanzania, Jane Goodall discovered that chimps have personalities, intimate relationships, and agendas. Her work and that of scientists who followed in her footsteps also taught us that chimps are a male-dominant species, prone to not-infrequent violence, with males harassing and sexually coercing lower-ranking female troop members. But our wiring looks less nasty, brutish, and bro-y if we throw over chimps in favor of another close primate relative, the bonobo.

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Mysterious "ghost apes" may have interbred with the great apes known as bonobos just as modern humans repeatedly had sex with now-extinct human lineages, a new study finds. Bonobos are, with chimpanzees, humanity's closest living relatives. Together, bonobos and chimps are part of the group Panjust as modern humans and extinct lineages of humans make up the group Homo. Recently, geneticists discovered that ancestors of modern humans often interbred with extinct human lineages such as Neanderthals and Denisovans.

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