Popular Science: Could Scientists have Found a Gay Switch?
National Geographic: Homosexual Activity Among Animals Stirs Debate
Wikipedia: Animal Sexual Behavior
SEED: The Effeminate Sheep and Other Problems with Darwinian Sexual Selection
News Medical: 1500 Animal Species Practice Homosexuality
YouTube: Let's Talk About Sex: The Science of Love
YouTube: Why are there gay men?
60 Minutes: Exploring Sexual Orientation
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