It had two main themes: the first, implied but never bluntly stated in The Origin, was that the human species had evolved from ape-like ancestors. The second was the proposal of a second, supplementary mechanism of evolutionary change, based not on natural but sexual selection. Why, Darwin had wondered, were the males and females of many species so strikingly different, and why in particular did the males often sport such seemingly improbable, and certainly unwieldy features as the peacock's tail, the turkey's wattles, or the stag's antlers?
Not everybody attracted to the same sex feels this way, however. A minority of gay men, and — according to psychologists, such as Lisa Diamond at the University of Utah — certainly many gay women, feel that their sexual orientation is something more fluid and malleable; something that can change, can be shaped by experiences, and is intensified by attachment. Others suggest that homosexuality serves a useful evolutionary purpose — more on that later.
Search RN. Is there an evolutionary reason or even an advantage to be burdened by bumps in one's adolescence, when it is shown that acne causes people to marry later, to have poorer jobs and be more likely to be unemployed? Terence Kealey argues it may actually promote sexual success.
Why are human males, on average, bigger and stronger than females? This is true not only in our species, but in our three closest relatives: chimpanzees, orangutans, and gorillas, as well as in most primates there are a few exceptions, like gibbons. And if males competed for females, that reflects a difference between the sexes in reproductive strategy—that is, in behavior.
DragonflyIssuesInEvolution explains :. It was originally thought that in some species such as deer and gorillas, only the dominate male mates successfully. But, through direct observation and DNA analysis, it is now known that often other males surreptitiously successfully mate when they can find the opportunity.
We used dietary manipulations as well as manipulation of potential mate availability to investigate how male sexual signalling changes with current budget and previous expenditure. Shedding a few pounds might be a good strategy in the human dating game, but for crickets the opposite is true. Well-fed male crickets make more noise and mate with more females than their hungry counterparts, according to research by the universities of Exeter and Stirling.
Could your Munchausen-by-proxy hypothesis regarding the Human Social Justice Warrior be better described as a form of Human Paratrepsis Injury-feigning? Similar to what we observe in non-arboreal birds and other species? This behavior could also cohere with the 'Sneaky Fucker' mating strategy and Aposematism.
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The term "sneaky fuckers" was coined by evolutionary biologist John Maynard Smith to describe subordinate males who take advantage of the opportunity to mate with females while dominant males are otherwise occupied, leading to their reproductive success Smith, It was originally thought that in some species such as deer and gorillas, only the dominate male mates successfully. But, through direct observation and DNA analysis, it is now known that often other males surreptitiously successfully mate when they can find the opportunity.