View this post on Instagram A post shared by Philadelphia Zoo (@philadelphiazoo) Nov. 19 (UPI) -- The Philadelphia Zoo announced the birth of a pair of pied tamarin monkey twins -- the second such set of twins to be born at the facility this year. The zoo announced on social media that the twins were born in mid-September to mother Whitney and father Napoleon. The new babies are the second set of twins born to their parents this year, after Whitney previously delivered two monkeys in February. "

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