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Park			Taxon Code
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National Park Service
U.S. Department of the Interior

NPSpecies - Park Species Profile


Empidonax traillii
Willow Flycatcher
Prince William Forest Park
			Record Status: Approved
Occurrence:	Present
Nativeness:	Native
Abundance:	Rare

Scientific Name with Authority:		Empidonax traillii (Audubon, 1828)
Park Preferred Common Name(s):
Park Synonyms:

Taxonomic Hierarchy:		Kingdom Animalia, Phylum Chordata, Subphylum Vertebrata, Order Passeriformes, Family Tyrannidae, Genus Empidonax, Species Empidonax traillii


Seasonality Tags:
Migratory


Threatened/Endangered Status:		SC
State Species of Concern Status:
Ozone-sensitive Status:
NatureServe Global Rank:		G5
NatureServe State Rank:		VA: S4B
Evidence:		1 Observations, 0 Vouchers, 1 Data Store References, 0 External Links


Other Parks Where Species is Listed:
Acadia National Park	Allegheny Portage Railroad National Historic Site
Anacostia Park	Apostle Islands National Lakeshore
Arches National Park	Assateague Island National Seashore
Badlands National Park	Bandelier National Monument
Big Bend National Park	Big Hole National Battlefield
Bighorn Canyon National Recreation Area	Black Canyon of the Gunnison National Park
Blue Ridge Parkway	Bluestone National Scenic River
Boston Harbor Islands National Recreation Area	Bryce Canyon National Park
Buffalo National River	Cabrillo National Monument
Canyon De Chelly National Monument	Canyonlands National Park
Cape Cod National Seashore	Cape Hatteras National Seashore
Capitol Reef National Park	Chaco Culture National Historical Park
Channel Islands National Park	Chesapeake and Ohio Canal National Historical Park
Chiricahua National Monument	City Of Rocks National Reserve
Colonial National Historical Park	Colorado National Monument
Crater Lake National Park	Craters of the Moon National Monument and Preserve
Cumberland Island National Seashore	Curecanti National Recreation Area
Cuyahoga Valley National Park	Death Valley National Park
Delaware Water Gap National Recreation Area	Devils Postpile National Monument
Dinosaur National Monument	Dry Tortugas National Park
Effigy Mounds National Monument	Eisenhower National Historic Site
El Malpais National Monument	Eleanor Roosevelt National Historic Site
Everglades National Park	Fire Island National Seashore
First State National Historical Park	Florissant Fossil Beds National Monument
Fort Caroline National Memorial	Fort Necessity National Battlefield
Fort Sumter National Historical Park	Friendship Hill National Historic Site
Gateway National Recreation Area	George Washington Carver National Monument
George Washington Memorial Parkway	Gettysburg National Military Park
Gila Cliff Dwellings National Monument	Glacier National Park
Glen Canyon National Recreation Area	Golden Gate National Recreation Area
Grand Canyon National Park	Grand Teton National Park
Grant-Kohrs Ranch National Historic Site	Great Basin National Park
Great Falls Park	Great Sand Dunes National Park and Preserve
Great Smoky Mountains National Park	Hagerman Fossil Beds National Monument
Hopewell Culture National Historical Park	Hopewell Furnace National Historic Site
Hubbell Trading Post National Historic Site	Indiana Dunes National Park
Isle Royale National Park	John Day Fossil Beds National Monument
Johnstown Flood National Memorial	Joshua Tree National Park
Katahdin Woods and Waters National Monument	Kenilworth Park and Aquatic Gardens
Kennesaw Mountain National Battlefield Park	Knife River Indian Villages National Historic Site
Lake Mead National Recreation Area	Lake Roosevelt National Recreation Area
Lassen Volcanic National Park	Lincoln Boyhood National Memorial
Manassas National Battlefield Park	Martin Van Buren National Historic Site
Mesa Verde National Park	Minute Man National Historical Park
Mississippi National River and Recreation Areas	Missouri National Recreational River
Mojave National Preserve	Morristown National Historical Park
National Capital Parks-East	Navajo National Monument
New River Gorge National Park and Preserve	Nez Perce National Historical Park
Niobrara National Scenic River	North Cascades National Park
Olympic National Park	Oregon Caves National Monument
Organ Pipe Cactus National Monument	Oxon Cove Park and Oxon Hill Run
Ozark National Scenic Riverways	Padre Island National Seashore
Parashant National Monument	Pecos National Historical Park
Petersburg National Battlefield	Petroglyph National Monument
Pictured Rocks National Lakeshore	Pipestone National Monument
Point Reyes National Seashore	Presidio of San Francisco
Redwood National Park	Rock Creek Park
Rocky Mountain National Park	Saint Croix National Scenic Riverway
Saint-Gaudens National Historical Park	Salinas Pueblo Missions National Monument
San Antonio Missions National Historical Park	San Juan Island National Historical Park
Santa Monica Mountains National Recreation Area	Sequoia and Kings Canyon National Parks
Shenandoah National Park	Shiloh National Military Park
Sleeping Bear Dunes National Lakeshore	Theodore Roosevelt Island National Memorial
Timpanogos Cave National Monument	Timucuan Ecological and Historic Preserve
Tule Springs Fossil Beds National Monument	Tumacacori National Historical Park
Tuzigoot National Monument	Upper Delaware Scenic and Recreational River
Valley Forge National Historical Park	Vicksburg National Military Park
Walnut Canyon National Monument	Whiskeytown National Recreation Area
Whitman Mission National Historic Site	Wilson's Creek National Battlefield
Wind Cave National Park	Wupatki National Monument
Yellowstone National Park	Yosemite National Park
Yucca House National Monument


Last Modified Date:	8/26/2003

NPSpecies - The National Park Service biodiversity database. IRMA Portal version.https://irma.nps.gov/npspecies. Accessed 9/25/2025 11:57:00 AM

NatureServe Global Rank and State Rank

NatureServe. 2017. NatureServe Web Service. Arlington, VA. U.S.A. Available http://services.natureserve.org. Accessed: 12/4/2017. Updated quarterly.

This information is provided by NatureServe (www.natureserve.org) and its network of natural heritage member programs, a leading source of information about rare and endangered species, and threatened ecosystems.


Species Profile	Page 1 of 1	9/25/2025 11:57:00 AM

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