Diet Overlap

Tamiasciurus hudsonicus (red squirrel) Erethizon dorsatus (common porcupine)

Common Diet

Abies arctica (Canadian spruce) Picea mariana (Black spruce)

Common Habitat

Acadia National Park Alaska Peninsula montane taiga Alaska-St. Elias Range tundra Alberta Mountain forests Alberta-British Columbia foothills forests Algonquin Provincial Park Allegheny Highlands forests Appalachian mixed mesophytic forests Appalachian-Blue Ridge forests Arctic National Wildlife Refuge Arizona Mountains forests Bandelier National Monument Banff National Park Beaver Creek Biosphere Reserve Beringia lowland tundra Beringia upland tundra Bighorn Canyon National Recreation Area Blue Mountains forests Bonanza Creek LTER Site British Columbia mainland coastal forests Brooks-British Range tundra Bruce Peninsula National Park Bryce Canyon National Park Canadian Aspen forests and parklands Cascade Mountains leeward forests Cedar Breaks National Monument Cedar Creek LTER Site Central British Columbia Mountain forests Central Canadian Shield forests Champlain-Adirondack Biosphere Reserve Chihuahuan desert Colorado Plateau shrublands Colorado Rockies forests Cook Inlet taiga Copper Plateau taiga Coram Biosphere Reserve Craters of the Moon National Monument Denali Biosphere Reserve Devils Tower National Monument Dinosaur National Monument Eastern Canadian forests Eastern Canadian Shield taiga Eastern forest-boreal transition Eastern Great Lakes lowland forests El Malpais National Monument El Morro National Monument Elk Island National Park Fathom Five National Marine Park Forillon National Park Fraser Plateau and Basin complex Fundy National Park Georgian Bay Islands National Park Glacier National Park Grand Canyon National Park Grand Teton National Park Great Basin shrub steppe Greenwater Provincial Park Guadalupe Mountains National Park Gulf of St. Lawrence lowland forests Hubbard Brook Biosphere Reserve Interior Alaska-Yukon lowland taiga Interior Yukon-Alaska alpine tundra Ivvavik National Park Jasper National Park Kejimkujik National Park Kejimkujik Seaside Adjunct Kluane National Park and Reserve Kootenay National Park Kouchibouguac National Park La Mauricie National Park Lake Roosevelt National Recreation Area Lake Superior Provincial Park Mid-Continental Canadian forests Midwestern Canadian Shield forests Montana Valley and Foothill grasslands Mount Revelstoke National Park Muskwa-Slave Lake forests Nahanni National Park Reserve New England-Acadian forests Niagara Escarpment Biosphere Reserve North America North Central Rockies forests Northeastern coastal forests Northern Canadian Shield taiga Northern Cordillera forests Northern mixed grasslands Northern Pacific coastal forests Northern short grasslands Northern tall grasslands Northern transitional alpine forests Northwest Territories taiga Ogilvie-MacKenzie alpine tundra Okanagan dry forests Pacific Coastal Mountain icefields and tundra Palouse grasslands Pecos National Historical Park Polar Bear Provincial Park Prince Albert National Park Pukaskwa National Park Redberry Lake Biosphere Reserve Reserve de la Biosphere de Charlevoix Riding Mountain Biosphere Reserve Rocky Mountain Biosphere Reserve Saint Lawrence Islands National Park Saint-Gaudens National Historic Site Saratoga National Historical Park Sleeping Bear Dunes National Lakeshore Snake-Columbia shrub steppe South Central Rockies forests Southern Great Lakes forests Southern Hudson Bay taiga Southwest Nova Biosphere Reserve Upper Midwest forest-savanna transition Voyageurs National Park Vuntut National Park Wapusk National Park Wasatch and Uinta montane forests Waterton Biosphere Reserve Western Great Lakes forests Western short grasslands Wind Cave National Park Wood Buffalo National Park Woodland Caribou Provincial Wilderness Park Wrangell-St. Elias National Park and Preserve Wyoming Basin shrub steppe Yellowstone Biosphere Reserve Yoho National Park Yukon Interior dry forests Zion National Park