Diet Overlap

Spinus pinus (Pine Siskin)
Sialia sialis (Eastern Bluebird)

Common Diet

Juniperus virginiana (Eastern Red-cedar)

Common Habitat

Acadia National Park
Algonquin Provincial Park
Allegheny Highlands forests
Amistad National Recreation Area
Antietam National Battlefield
Apostle Islands National Lakeshore
Appalachian mixed mesophytic forests
Appalachian-Blue Ridge forests
Arkansas Post National Memorial
Assateague Island National Seashore
Atlantic coastal pine barrens
Audubon National Wildlife Refuge
Badlands National Park
Bajío dry forests
Balsas dry forests
Bermuda subtropical conifer forests
Big Bend Biosphere Reserve
Big Cypress National Preserve
Blackwater National Wildlife Refuge
Bombay Hook National Wildlife Refuge
Bruce Peninsula National Park
Buffalo National River
Canadian Aspen forests and parklands
Cape Cod National Seashore
Cape Hatteras National Seashore
Cape Lookout National Seashore
Cape Romain National Wildlife Refuge
Carlsbad Caverns National Park
Carolinian-South Atlantic Biosphere Reserve
Catoctin Mountain Park
Cedar Creek LTER Site
Central and Southern mixed grasslands
Central Canadian Shield forests
Central forest-grasslands transition
Central Gulf Coastal Plain Biosphere Reserve
Central Mexican matorral
Central Plains Biosphere Reserve
Central tall grasslands
Central U.S. hardwood forests
Champlain-Adirondack Biosphere Reserve
Chattahoochee River National Recreation Area
Chesapeake & Ohio Canal National Hist. Park
Chickasaw National Recreation Area
Chihuahuan desert
Chippewa Nature Center
Chiricahua National Monument
Colonial National Historic Park
Congaree Swamp National Park
Coronado National Monument
Coweeta Hydrologic Laboratory LTER Site
Crosswinds Marsh
Cumberland Island National Seashore
Cuyahoga Valley National Park
East Central Texas forests
Eastern Canadian forests
Eastern forest-boreal transition
Eastern Great Lakes lowland forests
Edwards Plateau savanna
Edwin S. George Reserve
Effigy Mounds National Monument
Fathom Five National Marine Park
Felsenthal National Wildlife Refuge
Flint Hills tall grasslands
Fort Caroline National Memorial
Fort Davis National Historic Site
Fort Pulaski National Monument
Fundy National Park
Gateway National Recreation Area
George WA Carver National Monument
George Washington Birthplace National Monument
George Washington Memorial Parkway
Georgian Bay Islands National Park
Gettysburg National Military Park
Great Smoky Mountains National Park
Great Swamp National Wildlife Refuge
Greenwater Provincial Park
Guadalupe Mountains National Park
Gulf of St. Lawrence lowland forests
Homestead National Monument of America
Horseshoe Bend National Military Park
Hot Springs National Park
Hubbard Brook Biosphere Reserve
Indiana Dunes National Lakeshore
Isle Royale Biosphere Reserve
Jean Lafitte National Hist. Park & Preserve
Knife River Indian Villages National Hist. Site
Konza Prairie Biosphere Reserve
Kouchibouguac National Park
Lake Meredith National Recreation Area
Lake Superior Provincial Park
Land Between the Lakes Biosphere Reserve
Little River National Wildlife Refuge
Little St. Simons Island
Long Point Biosphere Reserve
Madrean Pine-Oak Woodlands
Mammoth Cave Area Biosphere Reserve (Natn'l Park)
Manassas National Battlefield Park
Mesoamerica
Middle Atlantic coastal forests
Mingan Archipelago National Park Reserve
Mississippi lowland forests
Morristown National Historical Park
Mount Mitchell State Park
Nebraska Sand Hills mixed grasslands
New England-Acadian forests
Niagara Escarpment Biosphere Reserve
North America
Northeastern coastal forests
Northern mixed grasslands
Northern short grasslands
Northern tall grasslands
Oak Ridge National Environmental Research Park
Ocmulgee National Monument
Okefenokee National Wildlife Refuge
Ozark Mountain forests
Ozark National Scenic Riverways
Pictured Rocks National Lakeshore
Piney Woods forests
Point Pelee National Park
Prince William Forest Park
Pukaskwa National Park
Riding Mountain Biosphere Reserve
Rocky Mountain Biosphere Reserve
Rondeau Provincial Park
Roosevelt Vanderbilt National Historic Site
Saguaro National Park
Saint Croix International Historic Site
Saint Lawrence Islands National Park
Saratoga National Historical Park
Scotts Bluff National Monument
Sevilleta LTER Site
Shenandoah National Park
Shortgrass Steppe LTER Site
Sierra Madre de Oaxaca pine-oak forests
Sierra Madre Occidental pine-oak forests
Sierra Madre Oriental pine-oak forests
Sleeping Bear Dunes National Lakeshore
South Atlantic Coastal Plain Biosphere Reserve
Southeastern conifer forests
Southeastern mixed forests
Southern Appalachian Biosphere Reserve
Southern Great Lakes forests
Southern Hudson Bay taiga
Tamaulipan matorral
Tamaulipan mezquital
Tawas Point State Park
Tennessee River Gorge
Texas blackland prairies
Trans-Mexican Volcanic Belt pine-oak forests
Upper Midwest forest-savanna transition
Upper Miss. River Nat'l Wildlife Refuge
Valley Forge National Historical Park
Vicksburg National Military Park
Virginia Coast Biosphere Reserve
Voyageurs National Park
Western Great Lakes forests
Western Gulf Coastal grasslands
Western short grasslands
Wheeler National Wildlife Refuge
Wind Cave National Park

Attributes / relations provided by
♦ 1del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ 2Study of Northern Virginia Ecology