Visitors to the Philadelphia Zoo might want to beware of stray cats: A new enclosed passageway allows lions and tigers to roam outside their exhibits.
Humans, though, can safely gawk at the predators traveling along Big Cat Crossing. The protected, open-air path snakes above the felines' habitat to an archway over the zoo's main promenade and ends at a viewing spot along a lake.
The concept for the catwalk unveiled Wednesday, May 8, 2014 stems from the increasingly common practice of animal rotation, which lets animals take in new stimuli while visitors encounter them in unexpected places. (AP)
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