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http://www.economist.com/science/displaystory.cfm?story_id=8074843
http://www.economist.com/science/displaystory.cfm?story_id=8074843
@Homosexuality has been recorded in some 1,500 species so far, and been well documented in about a third of these cases; ... Male Amazonian river dolphins, for example, penetrate the blowholes of other males; female bottlenose dolphins use their snouts as dildos on other females.
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