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Another Philadelphia Zoo Hippo Turns 25Birthday girl Unna, who just turned 25, led the way to her pool party as she and her roommate, Cindy, went for a swim.
With Warmer Weather, Philadelphia Zoo's Hippos Reintroduced to Outdoor HabitatHippopotamus expert and lead keeper Betsy Karkowski watched as the pair, Cindy and Unna, enjoyed their first dip in the outdoor pool.

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