Amazon Dolphin - The Amazon River dolphin or boto has been reported to form up in bands of 3-5 individuals enjoying group sex. The groups usually comprise young males and sometimes one or two females.
American Bison - Courtship, mounting, and full anal penetration between bulls has been noted to occur among American Bison
Penguins - In early February 2004 the New York Times reported that a male pair of chinstrap penguins in the Central Park Zoo in New York City were partnered and even successfully hatched a female chick from an egg.
Elephants - Males, who in elephants live apart from the general flock, often form "companionships", consisting of an older individual and one or sometimes two younger, attendant males with sexual behaviour being an important part of the social dynamic. Same-sex relations are common and frequent in both sexes, with Asiatic elephants in captivity devoting roughly 45% of sexual encounters to same-sex activity.
Giraffes - Male giraffes have been observed to engage in remarkably high frequencies of homosexual behavior. After aggressive "necking", it is common for two males giraffes to caress and court each other, leading up to mounting and climax. Such interactions between males have been found to be more frequent than heterosexual coupling.
Bonobo - A matriarchal society (unusual amongst apes), Bonobos are a fully bisexual species -- both males and females engage in heterosexual and homosexual behavior, being noted for lesbianism in particular. About 60% of all sexual activity in this species is between two or more females. While the homosexual bonding system in Bonobos represent the highest frequency of homosexuality known in any species, homosexuality has been reported for all great apes (a group which includes humans), as well as a number of other primate species.
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