Pictures: Tigers walk over zoo visitors' heads

8 May 2014 Last updated at 08:52 BST

Take a look at this brand new walkway that's been made in an American zoo that lets tigers and other big cats walk right over your heads.
Tiger
This tiger in Philadelphia Zoo in America looks like it's in a regular cage, right?
Tiger walking in tunnel
Wrong! It's walking along a brand new walkway built in the zoo for its large cats.
Tiger walking in tunnel
It's a chance for visitors to get closer to the animals and see them walking overhead. It also lets the animals have more room to walk, run and explore. Only two tigers have had a go so far.
Tiger walking in tunnel
"Once inside, the two cats like to run," says Andy Baker from the zoo, "I've seen them get up to pretty high speeds."
Tiger walking in tunnel
And of course it also gives the animals a chance to look down at all the visitors coming to see them!