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Tag: "mate" at biology news

For crickets, parasitic flies can stop the music

...as a selective pressure on male singing and female mate choice behavior. That said, not all of the find...more females in the fall, enabling male singers to mate many more times. Also, many male crickets never sing, apparently finding mates by simply walking ...

Male chimpanzees prefer mating with old females

...k, researchers examined this idea by studying male mate preferences within the Kanyawara chimpanzee community in Kibale National Park in Uganda. The researchers found that, in contrast to humans, male chimpanzees prefer older females to younger ones. They found that, compared to younger females, older fem...

Disappearing nest egg: Researcher studying declining numbers of macaws

...e says. "We know that they tend to stay with one mate for a long time. But we need to learn more about their breeding habits, their migration routes, more about their diet and many other things. The more we learn about these birds, the better our chances to save them." ...

Female pronghorns choose mate based on substance as well as show

...ic quality, have high-quality ornaments. "Female mate choice is likely a very important evolutionary for...signed paternity to the offspring. "The females' mate sampling creates a small group of males that each year sire more than one-half of all young," said B...

Beauty and the brain

...n't need to postulate an unconscious calculator of mate value or any other 'programmed-brain' argument to explain why prototypical images are more attractive," Winkielman said. "The mental mechanism appears to be extremely simple: facilitate processing of certain objects and they ring a louder bell. "Th...

Nice guys do finish first in lizards' evolutionary race

...eakers ?they casually sneak into female havens and mate without calling a lot of attention to themselves. Blues "beat" yellows because they're close to home keeping watch. Yellows "beat" orange because the bullies aren't sticking close enough to home to keep an eye on things. Research has focused on why ...

Electric fish in Africa could be example of evolution in action

...nt DNA, different communication patterns and won't mate with each other. However, they now have found a ca...ulses, said Arnegard, "They seem to only choose to mate with other fish having the same signature waveform as their own." Except for some, Arnegard has dis...

Zebra finch males prefer females with exaggerated maternal traits

...exactly match those of their parents. Such learned mate preferences may help drive the evolution of exaggerated traits and strong morphological differences between sexes ?phenomena seen frequently in birds and other animals. The findings are reported by Carel ten Cate, Machteld Verzijden and Eric Etman of...

Female birds boost up their eggs when hearing sexy song

...s long been known to attract females and influence mate choice decisions and even induce an alteration in the offspring's sex ratio. This study by Leitner et al. now shows experimentally that hearing attractive song also has a selective impact on female physiology. 45 female domesticated canaries partici...

Evolutionary forces explain why women live longer than men

...males who have a relatively lower status or lack a mate engage in a riskier pattern of behaviors in an attempt to get ahead, he said. ...

The higher the hierarchy, the greater the aggression

...nk"--the likelihood that an individual will get to mate successfully in that society based on their rank--or place in the social hierarchy. They can only pass on their genes when they reach the top of the hierarchy, usually after those ahead of them in the rank have died and they have inherited the right ...

Choosy females make colourful males

...hoice. It is therefore in the females' interest to mate with their own males. Red and blue light Yet how did these differences evolve? The red species occurs in deeper water than the blue species and therefore experiences different light conditions. Behavioural experiments showed that both species h...

Bird brains shrink from exposure to contaminants

... production is extremely important in attracting a mate or to mark out a territory. "The issue is not that DDT is killing these robins but if they are growing up in this one area and then move to another, they won't be able to attract any females." These effects were most prominent in the males, some ...

'Scent of a woman' tells male redback spiders to find a mate

...y fertilizing her eggs, meaning that males have to mate with a virgin to maximize their reproductive succe...kly so that they become sexually mature in time to mate with these virgin females before the females mate with someone else." These are opposing pressures, ...

Males with elevated levels of testosterone lead shorter lives but have more success siring offspring

...ival. Older, more experienced females preferred to mate with older males and realized higher reproductive success when they did so. While young males treated with testosterone increased their ability to attract older females, it resulted in poor reproductive performance. "Although testosterone increased...

Attractive birds more immune against bird flu

...ecies differ in appearance and why the choice of a mate is influenced by behaviour and appearance features.... In many species both males and females prefer to mate with those who have the largest or most colourful of these ornaments or who have the most complex so...

When mice choose mates, experience counts

Choosing a mate is a big decision. And, at least for mice, it's on...ientists understand the brain chemicals that guide mate selection, Pfaff and his colleagues exposed female mice to odors of either a male mouse alone or a m...

Male rivalry increases when females at most fertile, say researchers

...te happily together, but when a female is ready to mate the two dominant males within the group become rivals and fight for her attention. Similarly in humans, rated dominance increases when the female is most fertile. What is interesting here is that male behaviour is determined by that of the females;...

Duck-billed dino crests not linked to sense of smell

...tors, or that they were used for visual display in mate selection or species recognition, similar to feather crests in some birds. ...

Adult stem cells aid recovery in animal model of cerebral palsy

...rms, A. gambiae M and A. gambiae S, that sometimes mate and create hybrid forms in nature. While it's uncl...ggests that individuals either naturally prefer to mate with others of their own form, or that there must be environmental and/or genetic conditions that ar...

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