Zoo visitors view the big cat trail
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Philadelphia Zoo lets tigers roam free on 'catwalk'

8 May 2014 Last updated at 15:49 BST

A zoo in Philadelphia has created a special "catwalk" which allows tigers and lions to roam around freely.

The big cats can now wander around in enclosed, overhead trails across the zoo's visitor pathways.

A similar trail for orang-utans and small primates had been opened at the zoo in the past.

The zoo's CEO Andrew Baker told BBC Radio 5 live's Up All Night: "Once they've all gotten past the newness of it... all the animals have had the opportunity to use it extensively."

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