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Originally Posted by Dyze
Maybe those penguins came to the zoo as eggs and have never seen females.
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I was thinking along similar lines. You see homosexual behavior in prison populations. There might be a similar effect in captive populations of male penguins.
I don't understand why trying to hatch rocks is evidence of homosexual behavior. I thought that in most species of penguins, males are high-investing. (Heterosexual males invest a lot in offspring, including sitting on the eggs).