A review of the literature suggests that same-sex behaviors may occur in many animal species. Writing in the journal Trends in Ecology & Evolution, researchers at the University of California Riverside say that their review suggests that same-sex behavior is a nearly universal phenomenon
in the animal kingdom, common across species, from worms to frogs to
birds. Bonobos, dolphins, penguins and fruit flies are all very different species that all exhibit some form of same-sex behavior, although the specific form of that behavior can vary greatly from species to species, from courtship to mounting to parenting. We'll talk with one of the authors of the article about research in the field, and how it ties into larger questions about evolutionary selection.
Produced by Annette Heist, Senior Producer