DCHP-1 Online
birchbark horn 
a device for calling moose.
See also: birchbark bugle birchbark trumpet moose-call (def. 2)
- 1888 (1890) The call is given through a birch-bark horn.
- 1956 "Many's a big bull I called up here . . . through my of birch-bark horn, and knockin' 'em down with that ol rifle. . . ."
- 1888 (1890) The call is given through a birch-bark horn.