hike or ride among the sprawling herds of elk and bison.izzly that prowl the back country. maybe, if you're lucky, you'll see a pack of the newest residents, wolves. the top of the food chain and the most controversial. they were reintroduced to the park in 1995. doug smith is the park biologist in charge of wolves. >> we brought back wolves with the idea that we wanted to restore natural systems. how can you do that without natural predators? >> reporter: the yellowstone wolves, the call of the wild, a reminder this is not your ordinary park. >> such a beautiful place. you tell me a better way to start the fourth than tom brokaw telling you about yellowstone national park. >> i'm hoping my son was watching. that is beautiful. >> tom, thanks so much. >>> coming up, the royal baby frenzy growing now in london, could be any day. we're live there this morning. first these messages. vo: traveling you definitely end up meeting a lot more people but a friend under water is something completely different. i met a turtle friend today so, you don't