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Great apes get trails at zoo

The Philadelphia Zoo has unveiled a network of trails that will allow many animals, from small lemurs and monkeys to large apes, bears, and cats, to make choices and explore new realms, traveling more freely than once thought possible in captivity.

Tua, a female Sumatran orangutan swings from a new trail at the Philadelphia Zoo August 14, 2012. ( DAVID SWANSON / Staff Photographer )
Tua, a female Sumatran orangutan swings from a new trail at the Philadelphia Zoo August 14, 2012. ( DAVID SWANSON / Staff Photographer )Read more
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