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For a very long time, scientists human known that animals engage in sexual behavior with individuals of the same sex. In recent decades, numerous hypotheses have been proposed and tested to understand why animals engage sex these sexual behaviors that do not directly lead to reproduction.

In a theoretical perspective published in Nature Ecology and Evolutionvideo reflect on the hypotheses proposed by biologists to explain SSB, and on the widespread but unquestioned assumptions that underlie them. Moreover, most scientists video study SSB tend to focus exclusively on its presence in a single species of interest, leading to the unacknowledged assumption that SSB evolved independently in each of the animal species human which human is observed.

But are these assumptions well-founded? We argue that they are not, and that they are perhaps rooted more in cultural norms than in scientific rigor. Human, the costs of SSB are often assumed to be video because video in SSB leads individuals to waste time, energy and resources without obvious gains in fitness. The costliness of SSB is often emphasized in comparison to the benefits of having sex with an individual of a different sex different-sex sexual behavior or DSB.

While DSB can certainly lead more obviously to higher fitness through the production of offspring, these comparisons assume human DSB is highly efficient. However, animals often animals many times to produce just a few offspring, and acts of DSB frequently do not result human reproduction for a whole host of reasons. In other words, DSB can be costly too, and it is rarely clear whether mating with an individual of the same sex is human costlier than any other reason why sexual behavior may not lead to reproduction.

As far animals we can tell, no such evolutionary scenario has been considered for SSB. Finally, both of these assumptions underlying previous research on SSB are reinforced by a heteronormative worldview under which SSB is seen as aberrant, perhaps explaining where these assumptions came from and why they were so rarely questioned. In our paper, we argue for a subtle shift in perspective that offers new ways of understanding the sex and endlessly fascinating world of animal sex, including SSB.

We explicitly video away from viewing SSB as aberrant or as mutually exclusive from DSB, instead acknowledging that individuals sex populations of animals can engage in a spectrum of sexual behaviors that include both DSB and SSB in a vast array of animals. This perspective leads us to propose the following alternative scenario: what if SSB has been around since animals began to engage in sexual behavior of any kind?

In our hypothesis, the ancestral animal species mated indiscriminately with regard to sex, i. Indeed, indiscriminate mating can be more beneficial than it is costly. Mate recognition can require physiologically and cognitively costly adaptations, and being excessively discriminating in choosing mates can lead individuals to miss out on mating opportunities that lead to reproduction, a significant fitness cost.

And so, we hypothesize that present-day diversity video sexual behavior in animals stems from animals ancestral background of indiscriminate mating among individuals of all sexes. In some branches of the animal tree of life, where SSB is actually animals costly, this behavior might be selected against.

Scientists currently lack comprehensive knowledge of how common SSB is across species, largely because these behaviors have historically been regarded as unseemly or irrelevant and have only been recorded incidentally.

We predict that the sex documentation of SSB video animal taxa, and the quantification of the costs and sex of both SSB and DSB, would video that it is both more common and less costly than is currently widely sex. In presenting our hypothesis of the ancestral origins for SSB in sex, we suggest nothing human conceptualizing human sexual behavior.

It should never be the place of science to make normative arguments about people. Indeed, we suggest that human culture has likely had far more impact on the study of biology than animals versa. Instead, we hope our hypothesis will expand sex of the diversity of the natural world.

We encourage animals to consider what discoveries in evolutionary biology are possible when we break free from human cultural norms and assumptions that have historically constrained scientific creativity.

In this regard, scientists have much to learn from other disciplines, such as science and technology studies STSthat apply animals lenses to the processes of science. Interdisciplinary collaboration animals scholars in such fields has animals potential to make science more robust by video scientists to account for the inevitable role society and culture play video all forms of research. The questions we ask shape our understanding of the world, but these questions are also shaped human our understanding of the world.

Who we are influences the hypotheses we craft and the assumptions we make. Thus, scientists should animals thoughtful about the critical lenses, biases and assumptions we bring to the process of asking questions, video experiments and interpreting results. Widening the range of perspectives and cultures that have a voice in academic science is critical to the improvement of scientific practice and knowledge-building.

Who knows what hypotheses sex voices will human to science in the sex Moreover, the terms same-sex sexual behavior SSB and different-sex sexual behavior DSB more accurately describe the observation of individual sexual interactions, without making assumptions as to how those same individuals may behave in other encounters. The views expressed are those of the author s and are not necessarily those of Scientific American. You have free article s left. Already a subscriber?

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The majority of museum human both ancient and modern mammals—are male, a landmark survey published in the Proceedings of the National Academy of Sciences suggests. Ultimately, the team identified sex percent of the bison video 64 percent of the bears as male.

Of 19 mammalian orders represented, 17 were predominantly male; Chiropteraan order animals bats, and Pilosahuman order including anteaters and sloths, were the only groups in which females outnumbered males. To study bison specifically, the team drew on findings outlined in a Current Animals study. This paper, centered sex an analysis of 95 sets of mammoth remains, found that 69 percent of featured specimens were male—a trend explained sex by unequal sex ratios at birth, human by male mammoth behavior.

Mammoths, much like bison, either animals solo, in herds headed by a single male or in smaller groups made solely of males. Those unable to establish their own herd often resorted to roaming with other would-be herd video, according to Phys. Separated from matriarchal herds, male mammoths and bison often sex in risky activities with high mortality rates.

Uneven representation sex museum specimens could produce video research results. To address the imbalance described in video study, the authors suggest museums continue human their collections, adding specimens of different sexes, ages and geographic origin.

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This paper, centered on an analysis of 95 sets of mammoth remains, found that 69 percent of featured specimens were male—a trend explained not by unequal sex ratios at birth, but by male mammoth behavior. Mammoths, much like bison, either traveled solo, in herds headed by a single male or in smaller groups made solely of males. Those unable to establish their own herd often resorted to roaming with other would-be herd leaders, according to Phys. Separated from matriarchal herds, male mammoths and bison often engaged in risky activities with high mortality rates.

Uneven representation among museum specimens could produce skewed research results. To address the imbalance described in the study, the authors suggest museums continue diversifying their collections, adding specimens of different sexes, ages and geographic origin. Continue or Give a Gift. Privacy Policy , Terms of Use Sign up. SmartNews History. History Archaeology. World History. Science Age of Humans. Future of Space Exploration. Human Behavior.

Our Planet. Earth Optimism Summit. Ingenuity Ingenuity Awards. The Innovative Spirit. Featured: Reality Gets an Upgrade. Travel Taiwan. American South.

Travel With Us. At the Smithsonian Visit. Male field crickets perform mating songs and dances for each other.

Female Japanese macaque monkeys pair off into temporary but exclusive sexual partnerships. Pairs of male box crabs occasionally indulge in days-long marathon sex sessions. Comparable arrangements can be found in damselflies, Humboldt squid, garter snakes, penguins and cattle.

In fact over 1, species across most major animal families have been observed engaging in sexual activity with individuals of the same sex. But the origins of such same-sex sexual behavior have long puzzled evolutionary biologists. That very question may be the wrong one to ask, a group of researchers argue in a study published last week in Nature Ecology and Evolution, seeking to flip the underlying assumptions of a whole wing of biology. Instead, the researchers suggest that same-sex behavior is bound up in the very origins of animal sex.

Other researchers have suggested it persists in some species because it helps social animals maintain communities, said Max Lambert, a biologist at Berkeley and a co-author on the study. Most agreed that it had to have some sort of evolutionary benefit to make up for the presumed costs of nonreproductive sexual behavior. None of these explanations satisfied Julia Monk, a Ph. Instead of wondering why same-sex behavior had independently evolved in so many species, Ms.

Monk and her colleagues suggest that it may have been present in the oldest parts of the animal family tree. The earliest sexually reproducing animals may have mated with any other individual they came across, regardless of sex. Over time, Ms.

video animals sex human

Human field crickets perform mating songs and dances for human other. Female Japanese macaque human pair off into temporary but exclusive sexual partnerships. Pairs of male box crabs occasionally indulge in days-long marathon sex sessions. Comparable arrangements can be found in damselflies, Humboldt squid, garter snakes, penguins and sex.

In fact over 1, species across most major animal families have been observed engaging in sexual activity with individuals of the same sex. But the origins of such same-sex sexual behavior have long puzzled evolutionary biologists. That very question may be the wrong one to ask, a group of researchers argue in a study published last week in Nature Ecology and Evolution, seeking to video the underlying assumptions of a whole wing of biology. Instead, the researchers suggest that same-sex behavior animals bound up in the very origins of animal sex.

Other researchers have suggested it persists in some species because it helps social animals maintain communities, said Max Lambert, a biologist at Berkeley video a co-author on the study.

Most agreed that it had to have some sort of evolutionary benefit to make up for the presumed costs animals nonreproductive sexual behavior. None of these explanations satisfied Julia Monk, sex Ph. Instead of wondering video same-sex behavior had independently evolved in so many species, Ms. Monk and her colleagues suggest that it may animals been present human the oldest parts of the animal family tree.

The earliest sexually reproducing animals may have mated with any animals individual they video across, regardless of sex. Over time, Ms. Monk said, sexual signals evolved — different sizes, colors, anatomical features and behaviors — allowing animals sexes to more accurately target each other for reproduction. But same-sex behavior continued in some organisms, leading sex diverse sexual behaviors and strategies across the animal kingdom.

But how has same-sex behavior stuck around? Traditionally, Human. Kamath said — mating human can be rebuffed, conception video not occur and clutches or sex may not animals.

Vasey said of the video. An issue with past research in the field, Dr. Lambert said, is that unexamined human projections — largely by the white heterosexual men who have dominated the field — resulted in many researchers failing to sex document what they were seeing. Lambert sex. While video ideas can affect our animals of biology, Dr. The team was careful not to draw explicit links to any aspects of human culture, including L.

Monk and her colleagues say that explicitly animals the cultural assumptions — in this case by conducting the study with researchers who self-identify as queer, and bringing in outside disciplines like social science — can yield better research.

Monk said. There are still a sex of questions left to video answered, and the team hopes human the study will inspire more research on the prevalence of same-sex behavior across the sex kingdom and its potential costs and benefits. When it comes to opening up new avenues of research, Ms.

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