Diet Overlap

Lagopus lagopus (Willow Ptarmigan) Acanthis flammea (Common Redpoll)

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 Aleutian Islands tundra Amur meadow steppe Arctic coastal tundra Arctic foothills tundra Baikalskiy Biosphere Reserve Barguzinskiy Biosphere Reserve Beinn Eighe National Nature Reserve Berezinskiy Zapovednik Beringia lowland tundra Beringia upland tundra Bonanza Creek LTER Site British Columbia mainland coastal forests Brooks-British Range tundra Caledon conifer forests Cascade Mountains leeward forests Celtic broadleaf forests Central British Columbia Mountain forests Central Pacific coastal forests Cook Inlet taiga Copper Plateau taiga Denali Biosphere Reserve Eastern Canadian forests Eastern Canadian Shield taiga Elimyssalon alue Fraser Plateau and Basin complex Gates of the Arctic National Park Glacier Bay National Park and Preserve Great Lakes Basin desert steppe Greenwater Provincial Park Gros Morne National Park Haapasuo-Syysniemi-Rutajärvi-Kivijärvi High Arctic tundra Interior Alaska-Yukon lowland taiga Interior Yukon-Alaska alpine tundra Isle of Rum National Nature Reserve Ivvavik National Park Jänessuo Jasper National Park Joutsenaapa - Kaita-aapa Katunsky Biosphere Reserve Kazakh forest steppe Khangai Mountains alpine meadow Khangai Mountains conifer forests Killarney National Park Kluane National Park and Reserve Kola Peninsula tundra Krkonose Kronotskiy Biosphere Reserve Lake Torne Area Laplandskiy Biosphere Reserve Low Arctic tundra Luiron suot Manchurian mixed forests Midwestern Canadian Shield forests Mongolian-Manchurian grassland Moor House-Upper Teesdale Biosphere Reserve Muskwa-Slave Lake forests Nahanni National Park Reserve Newfoundland Highland forests Noatak Biosphere Reserve North America North Atlantic moist mixed forests North Central Rockies forests North York Moors Northern Canadian Shield taiga Northern Cordillera forests Northern Karelian Northern Pacific coastal forests Northwest Russian-Novaya Zemlya tundra Northwest Territories taiga Ogilvie-MacKenzie alpine tundra Okskiy Biosphere Reserve Pacific Coastal Mountain icefields and tundra Parc National Suisse Pechoro-Ilychskiy Biosphere Reserve Prince Albert National Park Queen Charlotte Islands Queen Maud Gulf Bird Sanctuary Rahjan saaristo Sarmatic mixed forests Sayan Alpine meadows and tundra Sayan Intermontane steppe Sayan montane conifer forests Sayano-Shushenskiy Biosphere Reserve Scandinavian and Russian taiga Scandinavian Montane Birch forest and grasslands Selenge-Orkhon forest steppe Sokhondinskiy Biosphere Reserve South Avalon-Burin oceanic barrens South Pennine Moors Southern Hudson Bay taiga St. Kilda National Nature Reserve Taimyr-Central Siberian tundra Taimyrsky Biosphere Reserve Terra Nova National Park Teuravuoma-Kivijärvenvuoma Torngat Mountain tundra Tsentral'no-Lesnoy Biosphere Reserve Tsentral'no-Sibirskiy Biosphere Reserve Tuktut Nogait National Park Ubsunurskaya Kotlovina (Ubsunur Depression) Viiankiaapa Walker Bay Field Station Wapusk National Park Western Siberian hemiboreal forests Wood Buffalo National Park Wrangell-St. Elias National Park and Preserve Yukon Interior dry forests