Superdaddy Pyros keeps Pyrenees bear numbers up
The maternal effect: How mother deer protect their future kings
(Phys.org) —Do mothers invest more care in their sons if they believe their child is destined to be a king, president or a high-powered leader?
Mar 06, 2013
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Many heterosexual college males say 'That's so gay,' but why?
(Phys.org)—"That's so gay" is a popular expression on campuses nationwide among heterosexual students, especially young men. But why do they say it? A new University of Michigan study sheds light on this ...
Jan 30, 2013
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Bisexual fish boost mating chances
In an unusual mating strategy, hard-up males of a tiny, promiscuous fish species engage in homosexual acts in a bid to entice females to copulate with them, a study said Wednesday.
Dec 12, 2012
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Male chimpanzees choose their allies carefully
Study finds male chimpanzees may increase their chances of siring offspring by recognizing the importance of third-party relationships.
Dec 03, 2012
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Testosterone regulates solo song of tropical birds
(Phys.org)—In male songbirds of the temperate zone, the concentration of sex hormones is rising in spring, which leads to an increase in song activity during the breeding season. In the tropics, there has ...
Oct 31, 2012
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Adolescent male chimps in large community strive to be alphas
(Phys.org)—An Ohio University anthropologist reports the first observation of dominance relationships among adolescent male chimpanzees, which he attributes to the composition of their community.
Sep 20, 2012
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Researchers discover the African cichlid's noisy courtship ritual
African cichlids enjoy an alien, exotic courtship routine. A dominant male attracts choice females to his territory by dancing seductively. If the female is sufficiently impressed, she lays her eggs and immediately ...
Jun 13, 2012
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Pregnant gelada monkeys abort when new male enters group
(PhysOrg.com) -- Pregnant female geladas show an unusually high rate of miscarriage the day after the dominant male in their group is replaced by a new male, a new University of Michigan study indicates.
Feb 23, 2012
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Bonobos' unusual success story
Mate competition by males over females is common in many animal species. During mating season male testosterone levels rise, resulting in an increase in aggressive behavior and masculine features. Male bonobos, ...
Jan 23, 2012
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Paternity of subordinates raises cooperative effort in cichlids
Cichlid male nannies help out, especially if they've been sneaking.
Oct 12, 2011
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Fantastic Mrs. Fox -- mother knows best for urban fox families
In urban fox families, mothers determine which cubs get to stay and which must leave while fathers have little say in the matter, new research by biologists at the University of Bristol has found.
Jul 20, 2011
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High social rank comes at a price, researchers find
Being at the very top of a social hierarchy may be more costly than previously thought, according to a new study of wild baboons led by a Princeton University ecologist.
Jul 14, 2011
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Male African cichlid fish go from 'zero to 60' when mating calls, researchers find (w/ video)
(PhysOrg.com) -- In African cichlid fish society, only the dominant male reproduces. But Stanford researchers have found that if the dominant male disappears, a subordinate cichlid can rise to the procreative ...
Jul 14, 2011
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Birdsong independent of brain size
(PhysOrg.com) -- The brains of all vertebrates display gender-related differences. In songbirds, for example, the size of the brain areas that control their singing behaviour could be linked to the size of ...
Jun 13, 2011
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