Yes, especially in the following species:
Amazon molly
Bennett
Blackstripe topminnow
Bluegill Sunfish
Char
Grayling
European Bitterling
Green swordtail
Guiana leaffish
Houting Whitefish
Jewel Fish
Least Darter (Microperca punctulata)
Mouthbreeding Fish
Salmon
Southern platyfish
Ten-spined stickleback
Three-spined stickleback
Yes, roosters do exhibit homosexual behavior.
Worms are hermaphroditic, so no, they do not exhibit homosexual behavior or heterosexual behavior.
Yes, rams (male sheep) can exhibit homosexual behaviour.
Although there is no documented evidence that zebras exhibit homosexual behavior, there is a widely-held view that most mammals, possibly all mammals, have specimens exhibit homosexual behavior at one time or another.
Yes, they do.
Yes, in fact homosexual behavior has been observed in most mammals.
All primates, including apes, monkeys, and humans exhibit homosexual behavior, which may or may not be genetically linked.The primates that show the most homosexual behavior are Bonobos followed by humans.
most species on Earth exhibit homosexual behavior, but there is no species that is exclusively homosexual. (That would be impossible).
about 1500 species, ranging from primates to gut worms, have been observed engaging in homosexual behavior.
Yes, all species of monkeys do.
Yes. The animal with the most frequent observations of homosexual behavior are the bonobos of Africa.For more information see Animals Displaying Homosexual Behavior
There is documented evidence of homosexual behavior in many mammals, birds, insects and fish. Black Bears, Brown Bears, and Polar Bears have all been documented in cases where they exhibit homosexual behavior.