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And Tango Makes Three by Justin Richardson (2005)
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Amazon.com Product Description (ISBN 0689878451, Hardcover)In the zoo there are all kinds of animal families. But Tango's family is not like any of the others.
(retrieved from Amazon Thu, 12 Mar 2015 18:11:49 -0400)
At New York City's Central Park Zoo, two male penguins fall in love and start a family by taking turns sitting on an abandoned egg until it hatches.
(summary from another edition)
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