Diet Overlap

Quiscalus quiscula (Common Grackle)
Dryobates pubescens gairdnerii (Downy Woodpecker)

Common Diet

Fagus grandifolia (American beech)
Quercus velutina (Black Oak)

Common Habitat

Acadia National Park
Alberta Mountain forests
Alberta-British Columbia foothills forests
Algonquin Provincial Park
Allegheny Highlands forests
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
Bandelier National Monument
Banff National Park
Big Cypress National Preserve
Big Thicket Biosphere Reserve
Bighorn Canyon National Recreation Area
Blackbeard Island National Wildlife Refuge
Blackwater National Wildlife Refuge
Bombay Hook National Wildlife Refuge
Bruce Peninsula National Park
Buffalo National River
California Coast Ranges Biosphere Reserve
Calvin College Ecosystem Preserve
Canadian Aspen forests and parklands
Canaveral National Seashore
Cape Breton Highlands National Park
Cape Cod National Seashore
Cape Hatteras National Seashore
Cape Lookout National Seashore
Cape Romain National Wildlife Refuge
Capital Reef National Park
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 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
Chippewa Nature Center
Colonial National Historic Park
Colorado Rockies forests
Congaree Swamp National Park
Coweeta Hydrologic Laboratory LTER Site
Crosswinds Marsh
Cumberland Island National Seashore
Curecanti National Recreation Area
Cuyahoga Valley National Park
De Soto National Wildlife Refuge
Death Valley National Park
Devils Tower National Monument
Dinosaur National Monument
East Central Texas forests
Eastern Canadian forests
Eastern forest-boreal transition
Eastern Great Lakes lowland forests
Edwin S. George Reserve
Effigy Mounds National Monument
El Malpais National Monument
El Morro National Monument
Elk Island National Park
Everglades
Fathom Five National Marine Park
Felsenthal National Wildlife Refuge
Fire Island National Seashore
Flint Hills tall grasslands
Florida sand pine scrub
Forillon National Park
Fort Caroline National Memorial
Fort Matanzas National Monument
Fort Necessity National Battlefield
Fort Pulaski National Monument
Friendship Hill National Historic Site
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
Grand Portage National Monument
Grandfather Mountain
Grasslands National Park
Great Smoky Mountains National Park
Great Swamp National Wildlife Refuge
Greenwater Provincial Park
Gros Morne National Park
Gulf of St. Lawrence lowland forests
Harpers Ferry National Historical Park
Herbert Hoover National Historic Site
Homestead National Monument of America
Hopewell Furnace National Historic Site
Horicon National Wildlife Refuge
Horseshoe Bend National Military Park
Hubbard Brook Biosphere Reserve
Indiana Dunes National Lakeshore
Isle Royale Biosphere Reserve
Jasper National Park
Jean Lafitte National Hist. Park & Preserve
Kejimkujik National Park
Kellogg Biological Station LTER Site
Knife River Indian Villages National Hist. Site
Konza Prairie Biosphere Reserve
Kouchibouguac National Park
La Mauricie National Park
Lacassine National Wildlife Refuge
Lake Meredith National Recreation Area
Lake Superior Provincial Park
Land Between the Lakes Biosphere Reserve
Lincoln Boyhood National Memorial
Little River National Wildlife Refuge
Little St. Simons Island
Long Point Biosphere Reserve
Mammoth Cave Area Biosphere Reserve (Natn'l Park)
Manassas National Battlefield Park
Mid-Continental Canadian forests
Middle Atlantic coastal forests
Midwestern Canadian Shield forests
Mingan Archipelago National Park Reserve
Mississippi lowland forests
Mojave and Colorado Deserts Biosphere Reserve
Montana Valley and Foothill grasslands
Moores Creek National Battlefield
Morristown National Historical Park
Muskwa-Slave Lake forests
Nahanni National Park Reserve
National Capital Parks - Central
National Capital Region - East
Nebraska Sand Hills mixed grasslands
New England-Acadian forests
New River Gorge National River
Newfoundland Highland forests
Niagara Escarpment Biosphere Reserve
North America
North Central Rockies forests
Northeastern coastal forests
Northern Cordillera forests
Northern mixed grasslands
Northern short grasslands
Northern tall grasslands
Oak Ridge National Environmental Research Park
Okefenokee National Wildlife Refuge
Ozark Mountain forests
Ozark National Scenic Riverways
Pictured Rocks National Lakeshore
Piney Woods forests
Pipestone National Monument
Point Pelee National Park
Point Reyes National Seashore
Prince Albert National Park
Prince Edward Island National Park
Prince William Forest Park
Pukaskwa National Park
Redberry Lake Biosphere Reserve
Redwood National Park
Reserve de la Biosphere de Charlevoix
Riding Mountain Biosphere Reserve
Rock Creek Park
Rocky Mountain Biosphere Reserve
Rondeau Provincial Park
Roosevelt Vanderbilt National Historic Site
Saint Croix International Historic Site
Saint Lawrence Islands National Park
Saint-Gaudens National Historic Site
Salt Plains National Wildlife Refuge
Saratoga National Historical Park
Scotts Bluff National Monument
Sevilleta LTER Site
Shortgrass Steppe LTER Site
Sleeping Bear Dunes National Lakeshore
South Atlantic Coastal Plain Biosphere Reserve
South Avalon-Burin oceanic barrens
South Central Rockies forests
South Florida rocklands
Southeastern conifer forests
Southeastern mixed forests
Southern Appalachian Biosphere Reserve
Southern Great Lakes forests
Southwest Nova Biosphere Reserve
Tawas Point State Park
Tennessee River Gorge
Texas blackland prairies
Thomas Stone National Historic Site
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
Waterton Biosphere Reserve
Western Great Lakes forests
Western Gulf Coastal grasslands
Western Michigan University’s Asylum Lake
Western short grasslands
Wheeler National Wildlife Refuge
Wilson's Creek National Battlefield
Wind Cave National Park
Wood Buffalo National Park
Woodland Caribou Provincial Wilderness Park
Yellowstone Biosphere Reserve
Yoho National Park

Attributes / relations provided by
1Study of Northern Virginia Ecology