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.

How female hyaenas came to dominate males

In most animal societies, members of one sex dominate those of the other. Is this, as widely believed, an inevitable consequence of a disparity in strength and ferocity between males and females? Not necessarily. A new study ...

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 been little evidence ...

Even low-level PCBs change bird songs

It may not kill them outright, but low-level PCB (polychlorinated biphenyls) contamination disrupts how some birds sing their songs, report Cornell researchers.

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 question.

Mountain gorilla mamas sidestep having inbred offspring

Some mountain gorilla females linger into adulthood in the group into which they were born. In the process they also remain in the company of their father, who is often their group's dominant male. To curb inbreeding, though, ...

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