Furbearer trapping seasons open soon, with the beaver, otter, muskrat and mink season opening Nov. 1 and the bobcat, marten, fisher and wolverine season opening Dec. 1. Montana Fish, Wildlife & Parks officials say furbearer populations are up, with the exception of muskrat and mink numbers, which, based on FWP harvest surveys conducted after the 2001 season appear to be down slightly. "Bobcat populations around the state have increased in part because the rabbit populations have been booming," said Brian Giddings, FWP furbearer coordinator. Giddings said thriving bobcat populations have made higher harvest quotas possible in Trapping District 4 around Great Falls, and Trapping District 5 around Billings. Giddings said trappers should be aware of two regulation changes: