Pictures of Big Cat Crossing at the Philadelphia Zoo

<div class="meta image-caption"><div class="origin-logo origin-image "><span></span></div><span class="caption-text">Amur tigers walk across a passageway after a new conference at the Philadelphia Zoo, Wednesday, May 7, 2014, in Philadelphia. The see-through mesh pathway called Big Cat Crossing is part of a national trend called animal rotation that zoos use to enrich the experience of both creatures and guests. &#40;AP Photo&#47;Matt Slocum&#41;</span></div>
May 7, 2014 9:22:35 AM PDT