For clairfication the "8 hour tour" is the Tundra Wildlife and the 3 hour is the Natural history. I am puzzeled that one bus leaving right after another saw different sightings??? They are on the same road- one goes in farther than the other and you will often get cooperation and and several buses viewing the wildlife. A significant enhancement is taking the first bus out on the SHUTTLE- excellent wildlife viewing. I always go to at least Eielson visitor center- the tour buses don't go this far. Be sure to realize and research- there are 2 buses- tour and shuttle and various lengths in.