Diet Overlap

Lagopus lagopus (Willow Ptarmigan) Calcarius lapponicus (Lapland Longspur)

Common Diet

Betula intermedia (dwarf birch) Empetrum nigrum (black crowberry)

Common Habitat

Alaska Peninsula montane taiga Alaska-St. Elias Range tundra Aleutian Islands Biosphere Reserve Aleutian Islands tundra Amur meadow steppe Arctic coastal tundra Arctic foothills tundra Arctic National Wildlife Refuge Aulavik National Park Barguzinskiy Biosphere Reserve Bering tundra Beringia lowland tundra Beringia upland tundra British Columbia mainland coastal forests Brooks-British Range tundra Cascade Mountains leeward forests Celtic broadleaf forests Central Pacific coastal forests Chukchi Peninsula tundra Copper Plateau taiga Da Hinggan-Dzhagdy Mountains conifer forests Denali Biosphere Reserve Glacier Bay National Park and Preserve Greenwater Provincial Park Gros Morne National Park High Arctic tundra Interior Alaska-Yukon lowland taiga Interior Yukon-Alaska alpine tundra Isle of Rum National Nature Reserve Ivvavik National Park Jasper National Park Joutsenaapa - Kaita-aapa Kamchatka Mountain tundra and forest tundra Kamchatka-Kurile meadows and sparse forests Kamchatka-Kurile taiga Kluane National Park and Reserve Kola Peninsula tundra Krkonose Kronotskiy Biosphere Reserve Laidauredeltat Lake Torne Area Laplandskiy Biosphere Reserve Low Arctic tundra Manchurian mixed forests Middle Arctic tundra Mongolian-Manchurian grassland Nahanni National Park Reserve North America North Central Rockies forests Northeast Siberian coastal tundra Northwest Russian-Novaya Zemlya tundra Novosibirsk Islands arctic desert Ogilvie-MacKenzie alpine tundra Okskiy Biosphere Reserve Ostrov Vrangelya (Wrangel Island) Zapovednik Pacific Coastal Mountain icefields and tundra Pechoro-Ilychskiy Biosphere Reserve Prince Albert National Park Queen Maud Gulf Bird Sanctuary Sayano-Shushenskiy Biosphere Reserve Scandinavian and Russian taiga Scandinavian Montane Birch forest and grasslands Sokhondinskiy Biosphere Reserve Southern Hudson Bay taiga St. Kilda National Nature Reserve Taimyr-Central Siberian tundra Taimyrsky Biosphere Reserve Torngat Mountain tundra Tuktut Nogait National Park Ubsunurskaya Kotlovina (Ubsunur Depression) Ukkusiksalik National Park Walker Bay Field Station Wapusk National Park Wood Buffalo National Park Wrangell-St. Elias National Park and Preserve Yamal-Gydan tundra