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According to Bruce Bagemihlwhen describing animals, the term homosexual is preferred over gaylesbianand other terms currently in use, as these are seen as even more bound to human homosexuality. Several species of whiptail lizard especially in the genus Aspidoscelis consist only of females that have the ability to reproduce through parthenogenesis. A similar behavior was also observed in the common bent-wing bat Miniopterus schreibersii. Wikimedia Commons has media related to Homosexual behavior in animals. Steroid hormones give hyenas a head start". Study of this unique genitalia and aggressive behavior in the female hyena has led to the understanding that more aggressive females are better able to compete for resources, including food and mating partners.

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Male Drosophila melanogaster flies bearing two copies of a mutant allele in the fruitless gene court and attempt to mate exclusively with other males.

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The only copies that were made available privately to researchers were translated into Greek, to prevent this knowledge becoming more widely known. Originally Posted by BreaOC. The behaviour is hormone driven and synchronizes with the emergence of estrus heatparticularly in the presence of a bull. Bat species that have been observed engaging in homosexual behavior in captivity include the Comoro flying fox Pteropus livingstoniithe Rodrigues flying fox Pteropus rodricensis and the common vampire bat Desmodus rotundus. The mounting male usually has an erect penis and accomplishes full anal penetration while performing pelvic thrusts that may lead to ejaculation. Dutch primatologist Frans de Waal on observing and filming bonobos noted that there were two reasons to believe sexual activity is the bonobo's answer to avoiding conflict. Sexual selection Breeding behaviour golden eagle seabirds Homosexual behavior.

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Certain species of gecko also reproduce by parthenogenesis. A pair of male Magellanic penguins who had shared a burrow for six years at the San Francisco Zoo and raised a surrogate chick, split when the male of a pair in the next burrow died and the female sought a new mate. The Jewish Daily Forward. They were eventually separated to try to promote breeding by placing one of them with female vultures, despite the protests of German homosexual groups. While the homosexual bonding system in bonobos represents the highest frequency of homosexuality known in any primate species, homosexuality has been reported for all great apes a group which includes humansas well as a number of other primate species.

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