This museum (704 Main St., 406/883-3049, 9 a.m.–5 p.m. Mon.–Sat., 10 a.m.–3 p.m. Sun., Memorial Day–Labor Day, $2 donation requested) is a dark jumbled place that houses a stuffed steer named Rudolf, a Lewis and Clark puppet display, and a 7.5-foot sturgeon caught in Flathead Lake [1] in 1955 and reputed to have been the Flathead Monster.
Links:
[1] http://www.moon.com/destinations/montana/missoula-and-northwestern-montana/flathead-lake