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National Park Service
U.S. Department of the Interior

NPSpecies - Park Species Profile


Empidonax traillii
Willow Flycatcher
Devils Postpile National Monument
			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


Management Tags:
Management Priority


Seasonality Tags:
Vagrant


Threatened/Endangered Status:		SC
State Species of Concern Status:		CA: SE
Ozone-sensitive Status:
NatureServe Global Rank:		G5
NatureServe State Rank:		CA: S3
Evidence:		2 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	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	Prince William Forest Park
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:	9/24/2005

NPSpecies - The National Park Service biodiversity database. IRMA Portal version.https://irma.nps.gov/npspecies. Accessed 9/25/2025 2:11:00 PM

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 2:11:00 PM

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