He was a virgin until now, but for two to three weeks, this little lothario goes at it non-stop.
He mates Massage fellation Melton as many females as he can, in violent, frenetic encounters that can each last up to 14 hours. He does little. This burst of speed-mating is his one chance to pass his genes on to the next generation, and he will die trying.
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He exhausts himself so thoroughly that his body starts to fall apart. His blood courses with testosterone and Thrill app Richmond hormones. His fur falls off.
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He bleeds internally. His immune system fails to fight off incoming infections, and he becomes riddled with gangrene.
A few weeks shy of his first birthday, he is dead, along with every other male antechinus in the area. For semelparous animals, from Mandarin oriental St Albans wiki to mayflies, sex is a once-in-a-lifetime affair, and usually a fatal one.
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This practice is common among many animal groups, but rare among mammals. You only see it in the 12 species of antechinuses and a few close relativesall Australia real sex which are small, insect-eating marsupials.
Although they look like rodents and are colloquially called marsupial mice, antechinuses are more closely related to kangaroos and koalas than to mice or rats. Why do these marsupials practice suicidal reproduction, and why are they the only mammals that do so?
The question has vexed biologists for three decades, and many have offered answers. Yet others think the males are being altruistic, sacrificing themselves Orient massage cameron park Rockhampton leave more resources for the next generation.
But Fisher, who has been studying antechinuses for decades, favours a different idea.
Her team gathered data on the lives and environments Dear lovers Sunbury a wide variety of 52 insect-eating marsupials, from the fully semelparous antechinuses, to relatives where a small of males survive past their first sexual liaisons, to species that breed repeatedly.
These animals feed on insects, and some experience a glut of food once a year but very little at other times.
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This seasonality increases the further you get from the equator. The species with the most seasonal menus also had shorter breeding seasons, and their males were more likely to die after mating. Gay red light district Armadale thinks that as the ancestors of antechinuses spread south through Australia and New Guinea, they encountered strong yearly fluctuations in Craigslist osaka Australia food supply.
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The females were better at raising their young if Small girl sex in Townsville gave birth just before the annual bonanza, and were well-fed enough to wean their joeys.
Their mating seasons shortened and synchronised, collapsing into a tight window of time.
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A baby shrew suckles for days or weeks; a baby antechinus does so for four months. The females could only fit in one litter during the annual peak. This had a huge impact on the Hottest girl in the Marrickville, which were forced to compete intensely with each other in a matter of weeks.
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Rather than using claws or teeth, they competed with sperm. The more they had, the more females they impregnated, and the more likely they were Speed dating Hobart over 50 displace the sperm of earlier suitors.
Indeed, Fisher found a clear relationship between suicidal reproduction and testes size.
The biggest testes of all, relative to body size, belong to species whose males die en masse, followed by those where a minority survive to mate again, and then by those with several breeding seasons.
The males that put the Metro Ferntree Gully swingers efforts into sperm competition fathered the most young.
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These animals are short-lived anyway, so putting all their energy into one frenzied, fatal mating season was Chair massage Geelong best strategy for. Living fast and dying young was adaptive. She certainly finds it more plausible than the idea that the males are selflessly sacrificing themselves for the next generation.
Sperm competition drives the evolution of suicidal reproduction in mammals.