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{{cquote|Roy and Silo, two male chinstrap penguins at New York's Central Park Zoo have been inseparable for six years now. They display classic pair-bonding behavior—entwining of necks, mutual preening, flipper flapping, and the rest. They also have sex, while ignoring potential female mates.}}

{{cquote|Roy and Silo, two male chinstrap penguins at New York's Central Park Zoo have been inseparable for six years now. They display classic pair-bonding behavior—entwining of necks, mutual preening, flipper flapping, and the rest. They also have sex, while ignoring potential female mates.}}

They were offered companionship of female penguins, they refused it. According to the chief keeper of the penguins Rob Gramzay, once both of them were so desperate to incubate an egg together that they used a rock as an egg and sat on it. In this way they the rock warm in the folds of their abdomen. After Gramzay gave them an egg, they incubated it and a chick named Tango was born. They also helped raising Tango.<ref name=CPZGPID/>

They were offered companionship of female penguins, they refused it. According to the chief keeper of the penguins Rob Gramzay, once both of them were so desperate to incubate an [[egg]] together that they used a rock as an egg and sat on it. In this way they the rock warm in the folds of their abdomen. After Gramzay gave them an egg, they incubated it and a chick named Tango was born. They also helped raising Tango.<ref name=CPZGPID/>

==References==

==References==