Amanda Onion writes in abcnews.com that monogamy may be good for a marriage, but in some animals, it’s bad for the species. Researchers in Ghana have discovered that animals living on reserves, with access to fewer mates than they would have in the wild, have a higher risk of extinction.
“In avoiding extinction, it pays to be promiscuous,” says biologist Justin Brashares. He analyzed the population levels of large mammals in six reserves in Ghana, where rangers have kept careful records for more than 30 years. In that time, 78 species became locally extinct, mostly due to hunting and loss of habitat. But it was monogamy that dealt the final blow: the males had only a small group of females available to mate with.