Hippos enjoy spring sun at Philadelphia Zoo

PHILADELPHIA (WPVI) -- It's a sure sign of spring when the hippos come out to play.

PHOTOS: Hippos come out to play at Philadelphia Zoo

The Philadelphia Zoo's female hippos, Cindy and Unna, basked in the spring sunshine Thursday morning.

Visitors gathered to watch the two take a dip in their outdoor pool for the first time this season.
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