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Various non-human animal species exhibit behavior that can be interpreted as homosexual or bisexual , often referred to as same-sex sexual behavior SSSB by scientists. This may include same-sex sexual activity , courtship , affection , pair bonding , and parenting among same-sex animal pairs. The sexual behavior of non-human animals takes many different forms, even within the same species, though homosexual behavior is best known from social species.
Scientists observe same-sex sexual behavior in animals in different degrees and forms among different species and clades. A paper states that it has been observed in over 1, species. Proposed causes for same-sex sexual behavior vary across species. Theories include mistaken identity especially for arthropods , sexually antagonistic selection , balancing selection , practice of behaviors needed for reproduction, expression of social dominance or submission, and social bonding.
The term homosexual was coined by the Hungarian writer and campaigner Karl Maria Kertbeny in to describe same-sex sexual attraction and sexual behavior in humans. According to Bagemihl, when describing animals, the term homosexual is preferred over gay , lesbian , and other terms currently in use, as these are seen as even more bound to human homosexuality. Bailey et al. Homosexual: in animals, this has been used to refer to same-sex behavior that is not sexual in character e.
In humans, the term is used to describe individual sexual behaviors as well as long-term relationships, but in some usages connotes a gay or lesbian social identity. Scientific writing would benefit from reserving this anthropomorphic term for humans and not using it to describe behavior in other animals, because of its deeply rooted context in human society. Animal preference and motivation is always inferred from behavior. In wild animals, researchers will as a rule not be able to map the entire life of an individual, and must infer from frequency of single observations of behavior.