Roy and Silo

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Cover of the children's book, And Tango Makes Three

Roy and Silo were a Chinstrap penguin couple in New York's Central Park Zoo.

The pair were observed trying to hatch a rock as if it were an egg. When the zoo staff realized that Roy and Silo were both male, it occurred to them to give them the second egg of a mixed-gender penguin couple, a couple which previously had been unable to successfully hatch two eggs at a time. Roy and Silo hatched and raised the healthy young chick, a female named "Tango" by keepers. Their story is the basis for the children's book And Tango Makes Three by Justin Richardson and Peter Parnell and illustrated by Henry Cole.

Tango is now a healthy young female penguin. She has formed a relationship with Tazuni, another female penguin. The two have paired the last two mating seasons. ^[1]

In 2005, Roy and Silo separated, after some six years of paired behavior, with Roy remaining single. Silo found another partner, a female called Scrappy.