Home, near and far.
This species breeds across northern Canada and Alaska, extending southward through the western mountains to California and Colorado. It winters along the Pacific coast and in the eastern half of the United States.
Birds Heard
FIELD GUIDE
FIELD GUIDE
New World Sparrows
Fox Sparrow
Passerella iliaca
The Fox Sparrow is a robust New World sparrow, recognized for its varied plumage across its extensive North American range. This species is often observed foraging on the ground, where it employs a distinctive scratching technique. Its presence is frequently detected by its rich, whistling song, particularly in its breeding territories.
migratorylarge sizemelodious songomnivorous diet
- Length
- 15-19 cm
- Wingspan
- 27-30 cm
- Weight
- 26-44 g
Typical adult measurements.
Individuals and populations vary.
01 / The telltale details
You’ll know it
when you see it.
Start with shape and behavior. Then look for the smaller details.
- 01
Plumage Variation
Coloration varies significantly by region, from foxy red in eastern populations to gray or dark sooty brown in western birds.
- 02
Heavy Streaking
Underparts are heavily spotted and streaked, often forming a messy central breast spot, though this can be less prominent in some western forms.
- 03
Rufous Tail
Most forms exhibit a reddish or rufous tail, which can be a key identification feature.
- 04
Thick Bill
Possesses a strong, conical bill, often bicolored with a darker upper mandible and a yellowish lower mandible.
02 / A place in the world
Where life
takes it.
Fox Sparrows breed in dense woodlands and brushy habitats, including boreal forests and western mountains. During winter, they can be found in similar dense cover, brushy fields, and even suburban areas and parks.
Stay a while. Or follow the season.
Fox Sparrows are migratory, with northern populations moving south for the winter. They typically migrate at night and can be seen as winter visitors or migrants across much of the contiguous United States.
03 / Listen a little closer
A voice
of its own.
The song is a series of clear, melodious whistles, considered among the richest of sparrows, though western forms may include harsher trills.
04 / The life behind the feathers
A day in its world.
On the menu.
Their diet is omnivorous, consisting of seeds, wild fruits, and insects. They also consume spiders and small snails, with coastal populations sometimes eating tiny crustaceans.
These birds primarily forage on the ground, often under dense cover. They use both feet simultaneously to kick backward, rustling through leaf litter to uncover food.
A place to begin.
Nests are typically cup-shaped and built by the female, often on the ground under dense shrubs or low in trees, usually no more than 2.5 meters high. They lay 2-5 pale green to greenish-white eggs with reddish-brown blotches.
The little routines.
Fox Sparrows are generally shy and prefer to stay hidden in dense vegetation. While solitary or in pairs during breeding, they may migrate in small flocks. Males sing to defend their territory.
One more reason to pay attention
A familiar face.
A few surprises.
The Fox Sparrow exhibits significant geographic variation, with at least four identifiable forms: Red, Sooty, Slate-colored, and Thick-billed, which some authors consider distinct species.
Fox Sparrows use a unique 'double-scratching' technique with both feet to uncover food from leaf litter.
Fossils of Fox Sparrows from the Pleistocene epoch have been discovered in Pennsylvania, Virginia, and California.
05 / An eye for the difference
Could it be
someone else?
Song Sparrow
Melospiza melodiaThe Fox Sparrow is generally larger and more heavily streaked than the Song Sparrow, with a more prominent rufous tail.
Spotted Towhee
Pipilo maculatusWhile both scratch for food, the Fox Sparrow has a more uniform streaked breast and lacks the Spotted Towhee's distinct black (male) or brown (female) hood and back.
Behind these field notesResearch & references · 12 sources
AI-assisted species research. Prepared September 2026. Details can vary across regions and populations.