Pictures Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview May 7, 2019 / 4:37 PM EDT / CBS News Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon Philadelphia Zoo's New WildWorks Ropes Course And Zipline Preview Credit: HughE Dillon