KENAI NATIONAL WILDLIFE REFUGE, Alaska - The moose were impatient for their supper. As soon as the four ungulates saw biologist Tom Lohuis, they began stomping around in their stables, letting out occasional guttural moans. It was time for their final experimental meal in a five-day research project carried out next to Lohuis' log-cabin office. "Hey, hey, hey," he said as 7-year-old Melody shoved her snout into the dish as soon as he set it down. "They know exactly what's coming." What goes in, of course, must come out. And those droppings are of great interest at the Kenai Moose...