Ron and Jacque Horn have returned from a trip with college friends David and Vicki Greshamto northwest Alaska to view and photograph the summer migration of the Western Arctic caribou herd. The foursome flew from Kotzebue 175 miles north to the Kokolik River where they spent seven days viewing and photographing an estimated 30,000 bull caribou that moved through the valley where they were camped. At 400,000 animals ranging over 140,000 square miles, the…