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15 minute alpine and subalpine alpine areas banded Berthoud Pass birds identified Boreas Pass breeding areas C.E. Braun Collins Colo Colorado Division Data distribution Division of Wildlife domestic livestock drainage basins ECOLOGY OF WHITE-TAILED females flocks observed Guanella Pass Handies Peak Harvard Quadrangle Hoffman Homestake Hoosier Pass identified at Guanella Immatures Independence Pass krummholz Lake late April livestock grazing Loveland Pass M.S. Thesis males winter Mean flock minute U.S.G.S. topographic number of birds Number Percent Number orado Peak Quadrangle Percent Number Percent Photo by C.E. ptarmigan in Colorado ptarmigan in winter ptarmigan Lagopus leucurus ptarmigan wintering areas Quad rangle Red Mountain Pass Redcloud Peak Rollins Pass snow depths Stevens Gulch Stewart Peak stream bottoms stream courses subadults subalpine areas suitable Taken from Handies Taken from Mt Tenmile Creek tion U.S.G.S. topographic map Univ white-tailed ptarmigan Lagopus Wildl Willow-dominated community wind action WINTER ECOLOGY winter flocks wintering habitats wintering populations