Diet Overlap

Lagopus lagopus (Willow Ptarmigan) Rangifer tarandus (caribou)

Common Diet

Betula intermedia (dwarf birch) Salix alaxensis (feltleaf willow)

Common Habitat

Alaska Peninsula montane taiga Alaska-St. Elias Range tundra Alberta Mountain forests Aleutian Islands Biosphere Reserve Arctic coastal tundra Arctic foothills tundra Arctic National Wildlife Refuge Aulavik National Park Baikalskiy Biosphere Reserve Barguzinskiy Biosphere Reserve Bering tundra Beringia lowland tundra Beringia upland tundra Bonanza Creek LTER Site Brooks-British Range tundra Cascade Mountains leeward forests Central British Columbia Mountain forests Cherskii-Kolyma mountain tundra Chukchi Peninsula tundra Cook Inlet taiga Da Hinggan-Dzhagdy Mountains conifer forests Denali Biosphere Reserve East Siberian taiga Eastern Canadian forests Eastern Canadian Shield taiga Europe & Northern Asia (excluding China) Fraser Plateau and Basin complex Gates of the Arctic National Park Great Lakes Basin desert steppe Gros Morne National Park High Arctic tundra Interior Alaska-Yukon lowland taiga Interior Yukon-Alaska alpine tundra Ivvavik National Park Jasper National Park Kamchatka Mountain tundra and forest tundra Kamchatka-Kurile meadows and sparse forests Kamchatka-Kurile taiga Kazakh forest steppe Kazakh steppe Khangai Mountains conifer forests Kluane National Park and Reserve Kostomukshsky Zapovednik Kronotskiy Biosphere Reserve Lake Torne Area Laplandskiy Biosphere Reserve Low Arctic tundra Middle Arctic tundra Midwestern Canadian Shield forests Muskwa-Slave Lake forests Nahanni National Park Reserve Newfoundland Highland forests Noatak Biosphere Reserve North America North Central Rockies forests Northeast Siberian coastal tundra Northeast Siberian taiga Northern Canadian Shield taiga Northern Cordillera forests Northern transitional alpine forests Northwest Russian-Novaya Zemlya tundra Northwest Territories taiga Ogilvie-MacKenzie alpine tundra Okhotsk-Manchurian taiga Ostrov Vrangelya (Wrangel Island) Zapovednik Pechoro-Ilychskiy Biosphere Reserve Prince Albert National Park Queen Maud Gulf Bird Sanctuary Sakhalin Island taiga Sayan Alpine meadows and tundra Sayan Intermontane steppe Sayan montane conifer forests Sayano-Shushenskiy Biosphere Reserve Scandinavian and Russian taiga Selenge-Orkhon forest steppe South Avalon-Burin oceanic barrens South Siberian forest steppe Southern Asia Southern Hudson Bay taiga Taimyr-Central Siberian tundra Taimyrsky Biosphere Reserve Torngat Mountain tundra Trans-Baikal Bald Mountain tundra Trans-Baikal conifer forests Tsentral'no-Sibirskiy Biosphere Reserve Tuktut Nogait National Park Ubsunurskaya Kotlovina (Ubsunur Depression) Ukkusiksalik National Park Ural montane forests and tundra Walker Bay Field Station Wapusk National Park West Siberian taiga Western Siberian hemiboreal forests Wood Buffalo National Park Wrangell-St. Elias National Park and Preserve Yamal-Gydan tundra Yukon Interior dry forests