This tour was excellent. We spent our time looking for wildlife but were able to arrange with Derrick whatever experience we wanted (i.e. hiking, wildlife watching, ...). We were lucky enough to not only spot the usual bison, pronghorn and elk, we saw coyote, fox, golden eagle, wolves and owls. We spent ample time watching the wolf pack on a recent bison kill. Derrick was very knowledgeable about the park and it's history along with where to go to have the best chance of seeing what you are interested in. We had a great time and Derrick was an excellent guide. We would consider returning on this tour in the future.