Sentences with phrase «competition for mates»

This association appears to mirror the winner effect, also observed in the animal literature, whereby victories in competition for mates or food have been associated with elevated testosterone levels, and increased aggression18, 19.

In virtually all higher primates, males have large, sharp canine teeth that they often use to threaten and attack other males during competition for mates, says Lovejoy.

The increased competition for mates, coinciding with the arrival of the birth control pill, helps to explain a number of things, such as the collapse of sexual taboos as young women began to offer free samples and to pursue men previously considered off limits (such as other women's husbands).

But the population is also much denser, making competition for mates and meals fierce.

Much of other animals» intraspecies violence is about competition for mates and the chance to pass on genes.

The research biologist in charge of the Oregon work, Audrey Magoun, then with the U.S. Forest Service Rocky Mountain Research Station, thinks some wolverines, male and female alike, may avoid the normal territorial competition for mates.

Is it that they are avoiding competition for mates, trying to preserve resources for the rest of the pack, or avoiding inbreeding?

Animals sometimes kill without need, or kill out of competition for mates (which we as Sapiens try not to do), or kill a large animal and leave much of it to rot (really, to be eaten by other animals).

Showy ornaments used by the male of the species in competition for mates, such as the long tail of a peacock or shaggy mane of a lion, could indicate a species» risk of decline in a changing climate, according to a new study from Queen Mary University of London (QMUL).

Small «sneaky» males reduce the advantage of large size for aggressive «fighter» males during competition for mates

By analyzing the fossils of thousands of ancient crustaceans, a team of scientists led by NMNH paleontologist Gene Hunt has found that devoting a lot of energy to the competition for mates may compromise species» resilience to change and increase their risk of extinction.

With colleagues there and at China's Hebei University, Chang wondered whether military weaponry and paraphernalia hold the same seductive value as antlers, horns and risky behavior, allowing warriors to best nonwarriors in the competition for mates.

Competition for mates and nesting sites probably took a toll: Only 2 percent of T. rex's relatives survived all the way to reach their maximum life span of about age 30.

That is the conclusion of the first study to provide concrete evidence for the evolutionary theory which proposes that competition for mates will increase male fertility, says Leigh Simmons at the University of Western Australia, Australia.

The second study of 272 women showed that they perceived a gay man to be more sincere than either a straight male or a straight female in scenarios in which the women were told potentially deceptive information that could lead to competition for a mate or a sexual encounter.

Darwin argued, and many researchers believe, that sexual selection — competition for mates — is the driving force for the evolution of such foppish ornamentation as a male peacock's tail and the stunning turquoise, white, and chestnut coloration of an adult male lazuli bunting.

The researchers made allowances for factors which may have accounted for variations in mortality rates, such as migratory behaviour, competition for mates and chick behaviour.

In nature, as well as in architecture, form follows function so if you train for performance, you'll soon look like you can perform and with the competition for mates becoming much fiercer in the zombie apocalypse, looking good is an added bonus.