Crocodiles instill fear in most people at any size. But crocodile conservationist Romulus Whitaker fears that the most colossal of these creatures might no longer exist. Rom suspects that human hunting may have selectively killed off crocs surpassing 20 feet in length. In Supersize Crocs, Rom...

In this Web-exclusive video, wolf expert Doug Smith discusses the Yellowstone Wolf Project. Started in 1994, the Wolf Project has taken advantage of the visibility of Yellowstones wolves to explore wolf population dynamics. Of particular interest is how wolves interact with prey and scavenger...