Somewhere in the rolling tundra east of Deadhorse, a lone wolf hunts. The 100-pound male will take anything it can catch, or find — a ptarmigan, a darting tundra rodent, a fish, the scraps of a carcass, or, if lucky, a moose calf or caribou. Hunger is a common companion, but the wolf somehow survived when his mate probably died of it last winter. That event may have triggered the lone wolf’s incredible summer journey from south of the Yukon River to the crumbling shores of the Beaufort Sea. The wolf has traveled about 1,500 miles in four months, according to biologist John Burch, who works for the National Park Service. Burch has studied wolves and the things wolves eat since the mid-1990s at Yukon-Charley Rivers National Preserve and Gates of the Arctic National Park and Preserve. Last November, he was part of a team that helicoptered to Copper Creek, a remote tributary of the clear-running Charley River. There, he tranquilized a healthy male wolf and fitted it with a satellite radio collar. The collar transmits GPS coordinates from the wolf every few days, which has allowed Burch to follow the wolf’s trans-Alaska trek this summer. Burch would have preferred that the wolf remain near Yukon-Charley, 2.5 million acres where the Yukon flows into Alaska. The wolf’s collar is expensive and would give useful information about one of a dozen wolf packs that use the preserve as part of their home range. But the lone male is telling the biologists a different story about wolf behavior — what happens when a pack breaks up.