Bird Profile
Fox Sparrow
A big, heavy-billed sparrow that kicks leaf litter backward with both feet at once. Which one you get depends on where you live: four regional forms look strikingly different.
The short answer
- Fox Sparrows are the bulkiest sparrows at most feeders, with a thick bill, a plain unmarked face and heavy triangular spots that merge into a central blotch on the breast.
- Four regional groups look very different: Red in the East, Sooty on the Pacific coast, Slate-colored in the interior West, Thick-billed in the California mountains.
- They forage with a double-scratch, hopping forward and kicking backward with both feet at once, which is loud enough that people mistake it for a squirrel.
- This is a ground bird: scatter millet, sunflower hearts and cracked corn on bare ground or a low tray near a brush pile, not in a hanging feeder.
- In most of the East they are migrants and winter visitors, heaviest in late October to November and again in March, so the feeder window is short.
At a glance
- Scientific name
- Passerella iliaca
- Length
- 5.9 to 7.5 in (15 to 19 cm)
- Wingspan
- 10.5 to 11.4 in (26.7 to 29 cm)
- Weight
- 0.9 to 1.6 oz (26 to 44 g)
- Range
- Breeds across boreal Alaska and Canada and in the western mountains; winters in the eastern and southeastern US and along the Pacific coast
- Favorite foods
- Seeds and leaf-litter invertebrates; white millet, sunflower hearts and cracked corn at feeders
- Best feeder
- Ground feeder or low tray beside dense cover
- At feeders
- Mainly October to April, with sharp peaks during migration
A Fox Sparrow arriving under your feeder announces itself before you see it. There is a loud rustling in the leaf litter, far too loud for a small bird, and when you look you find a big chunky sparrow throwing debris backward with both feet, working its way through the mulch like a small chicken.
It is the heaviest sparrow most feeder owners will see, and the most variable. A Fox Sparrow in Maine is rich rusty red. One in Seattle is dark chocolate brown. One in Colorado is gray-backed with rufous wings, and one in the Sierra Nevada has a bill so thick it looks like a different genus. All four are currently treated as a single species.
The feeding setup is straightforward once you accept that this bird will not use anything hanging in the air. Ground or a low tray, near cover it can reach in one flight, is the entire recipe.
This profile covers the identification problem, the four subspecies groups, the double-scratch, the seasonal timing that determines when you see one, and the yard structure that keeps them coming back.
How to identify a Fox Sparrow#
Size and shape come first. At 5.9 to 7.5 in (15 to 19 cm) and 0.9 to 1.6 oz (26 to 44 g), a Fox Sparrow is noticeably larger and rounder than a Song Sparrow, with a stout conical bill, a full chest and a fairly short tail for its bulk. Next to a junco it looks enormous.
The underparts carry heavy, coarse markings: chunky triangular spots or chevrons rather than the fine pencil streaks of a Song Sparrow, usually converging into a dark central blotch on the breast. The face is comparatively plain, without the crisp crown stripes of a White-crowned or the bold rusty cap of a Chipping Sparrow.
In flight, most forms show a rufous or reddish tail and rump that contrast with the back, which is where the fox in the name comes from. On Sooty birds the contrast is muted, and there the overall dark chocolate tone does the work.
Confusion species
| Bird | Shares | How to separate it |
|---|---|---|
| Song Sparrow | Streaked breast with a central spot | Smaller and slimmer, finer brown streaks, bold dark malar stripe, long rounded tail, striped crown |
| Hermit Thrush | Brown above, spotted below | Thin insect bill, dark eye in a pale eyering, walks rather than scratches, no conical bill |
| Brown Thrasher | Rusty above, marked below | Far larger with a long tail, curved bill and pale yellow eye. See Brown Thrasher |
| Spotted or Eastern Towhee | Big ground bird that scratches | Unstreaked black or brown hood, clean white belly, rufous flanks, red eye |
| Lincoln's Sparrow | Buffy, finely marked breast | Much smaller, fine crisp streaks on a buff wash, gray eyebrow, skulking |
| Purple Finch (female) | Brown, heavily marked below | Bold white eyebrow and dark cheek patch, notched tail, feeds in trees and at hanging feeders |
Bulk plus blotch
If a sparrow under your feeder looks a size too big, has a thick bill, a plain face and coarse triangular spots running into a dark central blotch, it is a Fox Sparrow. The finer distinctions between it and its neighbors are laid out in the sparrow ID guide.
The four subspecies groups#
Fox Sparrows fall into four well-marked regional groups. Ornithologists have argued for decades about whether they should be separate species, and they remain lumped as one in the current North American checklist. For a feeder watcher the practical point is simpler: know which one your region gets, and stop expecting the field guide's brightest plate.
| Group | Where | What it looks like |
|---|---|---|
| Red (Taiga) | Breeds boreal Alaska and Canada; winters in the eastern and southeastern US | Brightest form: rufous tail and wings, gray-and-rust patterned head, bold rusty triangular spots on a white breast |
| Sooty | Breeds coastal Alaska and British Columbia; winters along the Pacific coast to southern California | Uniform dark chocolate or sooty brown above with little contrast, breast heavily marked with dark brown spots |
| Slate-colored | Breeds the interior West: Great Basin, Rockies, interior British Columbia; winters mainly in the Southwest | Plain slate-gray head and back contrasting sharply with rufous wings and tail, dark blackish spots below |
| Thick-billed | Breeds the Sierra Nevada and southern Cascades; winters in California and the Southwest | Similar to Slate-colored but with a conspicuously deep, heavy, pale grayish bill |
If you feed in the Pacific Northwest or coastal California, the dark Sooty bird is what you will get, and it is the one most often misreported as a Song Sparrow. In the East, the Red group is the only one you will see and it is unmistakable once you have had a good look.
Range and feeder timing#
Fox Sparrows breed in dense shrubby habitat: willow and alder thickets, boreal forest edge, mountain chaparral and streamside tangles. Almost none of that is near a feeder.
In the East the species is a migrant and winter bird. Fall movement peaks from late October into November, birds winter through the Southeast and the lower Midwest, and there is a distinct northbound push in March and early April. In much of the Northeast and upper Midwest, the entire annual feeder experience is a handful of days in each of those windows, which is why feeding during migration is worth planning for.
On the Pacific coast the pattern is longer and steadier. Sooty Fox Sparrows arrive from September and October and stay into April, so a coastal yard from British Columbia to southern California can host them all winter. Interior western birds move downslope and south, and are most likely at feeders from November through March.
What Fox Sparrows eat#
For most of the year, the diet is a mix of invertebrates and seeds taken from the ground: beetles, ants, spiders, millipedes, flies and their larvae, plus grass and weed seeds. In late summer and fall they add fruit, including blueberries, elderberries, huckleberries, blackberries and grapes.
In winter, seeds and fruit carry them, supplemented by whatever they can dig out of leaf litter. This is why the leaf layer in a yard matters. A bed stripped bare and covered in landscape fabric supports no Fox Sparrows; a bed with a few inches of leaves supports them all winter. Native plants that drop leaves and fruit do double duty here.
The double-scratch#
Fox Sparrows, towhees and several other ground sparrows forage with a movement usually called the double-scratch: the bird hops forward, then kicks backward sharply with both feet at the same time, dragging leaf litter behind it and exposing the soil underneath. It then leans in to take whatever is uncovered.
Two things make it worth knowing. First, it is diagnostic behavior. A Song Sparrow picks and shuffles; a Fox Sparrow commits, and the whole body rocks with each kick. Second, it is loud. A single Fox Sparrow in dry leaves sounds like something much bigger, and it is a routine source of the phrase there is a squirrel in my mulch bed.
It also tells you how to feed them. A Fox Sparrow wants a substrate it can work: bare soil, mulch, leaf litter, or a tray with a shallow layer of seed. Seed on a hard slick surface gives it nothing to scratch through.
The feeder setup a Fox Sparrow uses#
- Scatter seed on open ground or in a ground feeder tray set within one short flight of a hedge or brush pile.
- A low platform feeder works if the ground stays wet, but keep it under about 3 ft (1 m).
- White proso millet is the staple, taken as readily by juncos and White-throated Sparrows.
- Sunflower hearts are eaten enthusiastically and leave no hulls on the ground.
- Cracked corn in small, dry amounts rounds out the ground scatter.
- Leave the spill zone under a hanging feeder unswept; a Fox Sparrow will work it without any further help.
Put the brush pile first
Fox Sparrows will cross open ground only if there is cover to bolt into. A loose brush pile of prunings 10 to 20 ft (3 to 6 m) from the feeding patch converts a yard they pass over into a yard they use. Build it before you worry about which seed to buy.
Ground feeding needs housekeeping
Seed left on damp soil grows mold, and dense ground flocks spread disease faster than birds on separate perches. Scatter small amounts you expect to be eaten in a day, move the feeding patch a few feet every couple of weeks, and follow the routine in cleaning schedule. Keep cats indoors: ground feeders are the birds they catch.
Nesting#
Nesting happens in dense shrub habitat far from most yards. The female builds a bulky cup of grass, moss, twigs and bark, either directly on the ground under a shrub or low in a dense bush, typically under a few feet up.
Clutches are usually 2 to 5 pale green eggs with reddish-brown markings. Incubation runs about 12 to 14 days and the young leave the nest roughly 9 to 11 days after hatching. Where the season allows, some pairs raise two broods.
The male's song is loud, rich and whistled, one of the better songs in the sparrow family, and coastal birds can be heard singing on late-winter mornings before they head north.
Population and conservation#
Fox Sparrows are widespread and reasonably common, and the species is not considered to be at high conservation risk. Because they breed in remote shrub habitat that standard roadside surveys cover poorly, continental trend estimates are less precise than for backyard species; treat any confident single number about them with caution.
Where local concern exists it is usually about specific groups rather than the whole species, since the four forms have separate ranges and separate pressures. Coastal development, chaparral loss and changes in boreal shrub habitat all matter to different populations.
Yard-scale hazards are the standard ground-bird set: cats, window collisions during migration, and pesticide use that strips the invertebrate layer out of leaf litter. See cats and birds and window strikes.
A Fox Sparrow setup that works#
- Build a brush pile or keep a dense hedge within 20 ft (6 m) of where you intend to feed.
- Scatter white millet and sunflower hearts on bare ground, mulch or a low tray beside that cover.
- Leave leaf litter in beds instead of clearing it; that is the bird's actual food supply.
- Watch the calendar: late October to November and again in March in the East, September to April on the Pacific coast.
- Keep the ground scatter small and fresh, and shift the feeding patch periodically.
- Listen for loud rustling in the leaves. That noise, not a flash of color, is how most people find their first Fox Sparrow.
Frequently asked questions#
Why does a Fox Sparrow kick leaves backward?
It is a foraging move called the double-scratch. The bird hops forward and kicks back with both feet simultaneously, dragging leaf litter aside to expose insects, spiders and seeds underneath. Towhees do the same thing. It is surprisingly loud, and people regularly mistake a single Fox Sparrow in dry leaves for a squirrel or a chipmunk.
Why does my Fox Sparrow look brown, not red?
Because of which group you have. Only the Red or Taiga group, which winters in the East, is bright rusty. Pacific coast birds belong to the Sooty group and are uniform dark chocolate brown. Interior western birds are Slate-colored, with a gray head and back and rufous wings, and Sierra Nevada birds are Thick-billed, with a very heavy pale bill.
Are Fox Sparrow subspecies separate species?
Not currently. The four groups differ enough in appearance, song and genetics that a split has been debated for decades, but they are still treated as one species, Passerella iliaca, in the standard North American checklist. Field guides usually illustrate them separately because they are so distinct in the field.
What do Fox Sparrows eat at feeders?
White proso millet, sunflower hearts and cracked corn, offered on the ground or a low tray. They will not use tube feeders and rarely use hoppers. Away from feeders they take beetles, spiders, millipedes and other leaf-litter invertebrates, along with weed seeds and fruit such as blackberries and elderberries.
How do I tell a Fox Sparrow from a Song Sparrow?
Bulk and markings. A Fox Sparrow is clearly larger and rounder with a thicker bill and a plainer face, and its breast markings are coarse triangular blotches merging into a big central spot. A Song Sparrow is slimmer, has fine brown streaks, a bold dark stripe down the side of the throat, and a longer rounded tail it pumps in flight.