Dark-eyed Junco

The Dark-eyed Junco is a small, common sparrow relative found throughout North America, often nicknamed the "snowbird" for its habit of appearing at feeders in winter alongside the first snows. It is highly variable across its range, with several distinct regional forms once considered separate species and still sometimes recognized by plumage type, including the widespread "Slate-colored" form (uniform dark gray above, white belly) and the western "Oregon" form (blackish hood, brown back and flanks, white belly).

Despite the plumage variation, all forms share a small, pale pinkish bill, dark eyes, and white outer tail feathers that flash conspicuously in flight, along with a generally plain white belly contrasting with darker upperparts.

Key Field Marks

• Small pale pink conical bill
• White outer tail feathers, flashing in flight
• Contrasting white belly against darker (gray, brown, or blackish-hooded) upperparts, depending on regional form
• Often forages on the ground, hopping and flicking its tail

Similar Species

• Chipping Sparrow: has a rufous cap and streaked back, unlike the junco's plain gray or brown upperparts, and lacks white outer tail feathers.
• Eastern Towhee: much larger, with a longer tail, red eyes, and rufous flanks, unlike the junco's small size and white belly.
• Other junco forms: within the species, Slate-colored, Oregon, Pink-sided, Gray-headed, and White-winged forms differ in the extent and color of the hood, back, and flanks, but all share the core junco shape and pink bill.

Habitat

Juncos breed in coniferous and mixed forests, often near clearings or edges, and in winter become common in a much broader range of habitats including gardens, parks, fields, and roadsides.

Range

They breed across most of Canada, Alaska, and mountainous or northern parts of the United States, and winter throughout most of the continental United States and northern Mexico.

Migration

Many populations are medium-distance migrants, moving from higher elevation or northern breeding areas to lower elevations and more southerly wintering grounds, arriving in much of the U.S. in fall and departing by spring.

Behavior

Juncos are typically seen foraging on the ground in flocks, hopping and scratching through leaf litter or snow, and flashing their white outer tail feathers, possibly as a signal to flockmates or to startle predators.

Voice

The song is a simple, musical trill on one pitch, similar to a Chipping Sparrow's trill but usually more musical; calls include a smacking "tick" note and twittering flight calls.

Feeding

They primarily eat seeds, especially in fall and winter, supplemented by insects during the breeding season; they commonly forage on the ground beneath feeders for spilled seed.

Nesting & Breeding

Females build a cup nest usually on or near the ground, often in a natural depression, root tangle, or under vegetation, laying 3-5 eggs. Juncos are a well-studied model species for research on winter flocking, dominance hierarchies, and hormonal regulation of behavior.