In recent years many studies have been published on animal homosexuality. Here, we reviewed the available observations on bat homosexual behaviour, presenting some behavioural hypotheses. Same-sex sexual behaviours can be classified in 6 different groups and till now have been documented in 22 species of megabats and microbats. Further investigations are required as many more species are expected to show similar behaviours.
animal homosexuality; coercive sex; captivity; Chiroptera
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