Yeah, they let you get close there. I was within 5 or so feet in many of those shots. The 70-200 is perfect for that area. One think I have tried and works but you need a 2nd camera is to put them both on cameras and strap them on your shoulder. It works with the 400mm DO because it's just 4 lbs and can easily go on a strap around your shoulder. You could switch to the 70-200 quickly that way. With bigger lenses this wouldn't work if you were constantly moving with the wildlife.
