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The correct usage of the term homosexual is that an animal exhibits homosexual behavior or even same-sex sexual behavior; however, this article conforms to the usage by modern research, applying the term homosexuality to all sexual behavior (copulation, genital stimulation, mating games and sexual display behavior) between animals of the same sex.

In most instances, it is presumed that the homosexual behavior is but part of the animal's overall sexual behavioral repertoire, making the animal "bisexual" rather than "homosexual" as the terms are commonly understood in humans, A majority of the research available concerning homosexual behavior in animals lacks specification between animals that exclusively exhibit same-sex tendencies and those that participate in heterosexual and homosexual mating activities interchangeably.

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.

This lack of distinction has led to differing opinions and conflicting interpretations of collected data amongst scientists and researchers.

The motivations for and implications of these behaviors have yet to be fully understood, since most species have yet to be fully studied.

"The mutant female mouse underwent a slightly altered developmental programme in the brain to resemble the male brain in terms of sexual preference" said Professor Chankyu Park of the Korea Advanced Institute of Science and Technology in Daejon, South Korea, who led the research.

His most recent findings have been published in the BMC Genetics journal on July 7, 2010.

Others firmly argue no evidence to support these claims exists when comparing animals of a specific species exhibiting homosexual behavior exclusively and those that do not.

Ultimately, empirical support from comprehensive endocrinological studies exist for both interpretations.

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