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Roy and Silo
Roy and Silo (born 1987) are chinstrap penguins who were a same sex male pair in New York City's Central Park Zoo. They were noted by staff at the zoo in 1998 to be performing mating rituals, although no actual sexual acts were witnessed, and in 1999 attempted to hatch a rock as if it were an egg. This inspired zoo keepers to give them an egg from another pair of penguins who could not hatch it, resulting in the couple raising a chick which was named Tango.
Tango herself formed a same sex relationship with another female penguin. Like many couples, Roy and Silo drifted apart after several years, and in 2005 Silo paired with a female penguin called Scrappy. Roy and Silo's story has been made into a controversial children's book and featured in a play. Their relationship has been used as arguments both by American liberals and the Christian right. The practice of allowing same sex penguin couples to adopt eggs has been repeated in other zoos around the world.
==History==
Roy and Silo met at the zoo and they began their relationship in 1998, and although staff never saw them in a sexual act, they were observed conducting other mating rituals typical of their species including entwining their necks and mating calls. In 1999 the pair were observed trying to hatch a rock as if it were an egg. They also attempted to steal eggs from other penguin couples.〔 When the zoo staff realized that Roy and Silo were both male, they tested them further by replacing the rock with a dummy egg made of stone and plaster. As it was "incubated real well" it occurred to the zoo keepers to give them the second egg of a mixed-sex penguin couple, a couple which previously had been unable to successfully hatch two eggs at a time. Roy and Silo incubated the egg for 34 days and spent two and a half months raising the healthy young chick, a female named "Tango". When she reached breeding age, Tango paired with another female penguin called Tanuzi. As of 2005, the two had paired for two mating seasons.〔
Shortly after their story broke in the press, Roy and Silo began to separate after a more aggressive pair of penguins forced them out of their nest.〔 In 2005, Silo found another partner, a female called Scrappy, who had been brought from SeaWorld Orlando in 2002.〔 Roy joined a group of unattached male penguins.〔 As of 2012, Roy and Silo are both thought to still be alive at around 25 years old, with the Central Park Zoo's website stating that penguins in captivity can live up to 30 years.〔(【引用サイトリンク】url=http://www.centralpark.com/guide/central-park-zoo/penguins.html )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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