Bird Profile

White-crowned Sparrow

The crisp black and white striped sparrow of winter ground flocks, and the brown and tan bird next to it that confuses everyone. Both are the same species, a year apart in age.

The White-crowned Sparrow (Zonotrichia leucophrys) is a large, upright, long-tailed sparrow about 6 inches (15 cm) long, and in winter it is one of the most numerous ground-feeding birds across the western and southern United States. Adults have a boldly striped black and white crown over a plain gray face, a clean unstreaked gray breast, a brown streaked back and a small pale bill that may be pink, orange or dull yellow.

The birds standing next to them with brown and tan head stripes are the same species in their first winter. That single fact settles most of the identification questions this bird generates.

This profile covers adult and immature identification, the confusion species, where the winter flocks come from, the ground feeding setup that works, and the regional song dialects that made this sparrow one of the most studied songbirds in North America.

How to identify a White-crowned Sparrow#

Posture first. This is a tall, clean-looking sparrow that often stands upright with the crown feathers raised into a peak, which gives it a slightly formal look compared with the hunched, streaky sparrows around it.

On an adult, the crown carries two broad white stripes separated by black: a white center stripe, black on either side of it, then a white stripe over each eye, then a black eyeline. Below that the face, throat and breast are plain smooth gray with no streaking, no white throat patch and no yellow. The back is brown with dark streaks, the wings show two thin white bars, and the bill is small, conical and pale.

Immatures: the brown and tan problem#

First-winter birds have exactly the same head pattern rendered in rich rusty brown and pale buff instead of black and white. The gray face, the unstreaked breast, the shape and the posture are identical. They keep that plumage from late summer until the following spring.

They are often traveling with adults, so a winter flock in a yard usually shows both types. Neither pattern indicates sex: males and females look alike at every age.

Confusion species#

Where the winter flocks come from#

White-crowned Sparrows breed across an enormous northern and western area: Alaska, the Canadian taiga and tundra edge, and the high mountains and coastal scrub of the western states. Most of that population migrates, moving south in fall to winter across the southern half of the US and into Mexico.

The result is a bird that is common in winter and largely absent in summer over most of its US range, with the reverse true in the mountains and the far north. Arrival is usually late September into October, and departure runs through April into early May.

Subspecies worth knowing about#

Several populations differ visibly, mostly in bill color and the pattern in front of the eye. Gambel's White-crowned Sparrow, the interior northern breeder, has an orange-pink bill and pale lores, and it fills the Southwest and interior West in winter. Mountain birds of the Rockies and Sierra Nevada have pink bills and black lores.

Two Pacific forms are yellow-billed. One breeds along the coast from British Columbia through the Pacific Northwest and winters south, and one is resident year-round in the coastal fog belt of California, where White-crowned Sparrows sing in July as well as January.

What they eat and the feeder setup that works#

White-crowned Sparrows are ground foragers. They hop rather than walk, scratch in leaf litter with a quick two-footed kick, and pick seed from open dirt, short grass and the drip line of shrubs. In summer they take large numbers of insects, and nestlings are fed almost entirely on animal prey.

Feed them low. A ground feeder or catch tray is the natural fit, and a low platform feeder a foot or two off the ground works nearly as well. Hanging tubes are essentially irrelevant to this bird except as a source of spillage.

Cover is not optional#

A winter sparrow flock will not settle in an open yard. These birds feed a few feet from cover and drop back into it constantly, so the practical requirement is dense low structure: a hedge, a thicket, an unpruned shrub group, or a brush pile built from prunings.

Put the seed within about 10 feet (3 m) of that cover. Farther out and the flock feeds nervously in short bursts, or skips the yard entirely in favor of one with better escape routes.

The same cover creates the main risk. Ground-feeding flocks near shrubs are the classic hunting setup for outdoor cats, which is worth addressing directly: see cats and birds.

Song dialects#

This is the bird's claim to fame outside birding. White-crowned Sparrows sing regional dialects: neighboring populations, sometimes only a few miles apart, sing recognizably different versions of the same basic song, and the differences persist across generations.

Research on Bay Area populations beginning in the 1960s established that young males learn their song by listening during a limited sensitive period early in life, and that birds raised without hearing an adult song never develop a normal one. That work is the foundation of much of what is now known about song learning in birds generally, and this sparrow was the test subject.

The song itself is usually a couple of clear whistles followed by a jumble of buzzes and trills, often described as sounding thin and slightly sad. The call is a sharp flat pink and a thin seet from birds in flight.

Nesting#

Most White-crowned Sparrows nest well away from feeders, in low shrubby habitat: tundra edge with dwarf willow, subalpine meadow with scattered conifers, coastal scrub, or brushy clearings. The exception is the resident coastal California population, which nests in gardens and park scrub.

The nest is an open cup of grass, twigs and rootlets lined with fine grass and hair, placed on the ground under a shrub or low in a bush. Clutches are typically 3 to 5 pale greenish or bluish eggs with reddish brown spotting. The female incubates for about 12 days, and young leave the nest around 8 to 10 days after hatching, often before they can fly well.

Pairs in the far north raise one brood in a short season. Coastal and lower-latitude birds may raise two or three.

Population and conservation#

White-crowned Sparrows remain abundant and widespread, and the species is not considered at risk. That said, long-term monitoring has picked up gradual declines in parts of the West over recent decades, and local coastal populations have contracted where scrub habitat was built over.

For a yard, the useful contribution is unglamorous: keep a shrub layer, leave leaf litter under it, skip the insecticide in nesting season, and put millet on the ground through the winter. What that looks like across a whole season is covered in winter bird feeding.

A White-crowned Sparrow setup that works#

• White proso millet scattered thinly on bare ground or a low tray, refilled each morning from October to April.
• Dense cover within 10 feet (3 m): a hedge, a thicket, or a brush pile of winter prunings.
• A ground tray under the main feeders to catch spillage, which is where the flock will spend most of its time anyway.
• Water at ground level, shallow and rough-bottomed.
• The same spot every day, because winter flocks run a circuit and a reliable yard stays on it.