Dark-eyed Junco

The Dark-eyed Junco (Junco hyemalis) is one of the most common and widely distributed forest-nesting sparrows in North America. Known affectionately as the 'snowbird' because they suddenly appear in southern lowlands and backyard gardens at the onset of winter, these small, active birds are a classic sign of the changing seasons. Juncos exhibit an extraordinary level of geographic variation, with several distinct plumage groups that were once considered separate species.

Key Field Marks

• Bill: A distinct, small, pale pinkish or horn-colored bill.
• Tail: Outer tail feathers are bright white, flashing conspicuously when the bird takes flight.
• Underparts: Clean white belly contrasting sharply with a darker chest and upperparts.

Major Subspecies Groups

• Slate-colored Junco (Eastern & Northern): Uniform dark slate-gray head, breast, and upperparts, with a clean white belly.
• Oregon Junco (Western): Contrast-rich plumage with a dark gray to black hood, a warm brown back, and rich peach-colored flanks.
• Gray-headed Junco (Rocky Mountains): Pale gray body with a bright rufous, saddle-like patch on the back and a dark eye-lore.
• Pink-sided Junco (Northern Rockies): Pastel gray head with broad, soft pinkish-brown flanks and a darker mask through the eyes.
• White-winged Junco (Black Hills): Slightly larger, pale gray overall with two faint white wing bars on the wings.

Similar Species

• Black-chinned Sparrow: Lacks the clean white belly and the bright white outer tail feathers.
• Spotted or Eastern Towhees: Much larger with bright red/orange eyes and different facial markings, though Oregon juncos can superficially mimic their color scheme.

Habitat

During the breeding season, Dark-eyed Juncos nest in moist coniferous or mixed-coniferous forests, particularly in areas with open understories, forest edges, clearings, and recent burns. In winter, they expand into a vast array of open habitats including brushy fields, parks, suburban gardens, and roadside edges.

Range and Migration

Their breeding range spans from Alaska across Canada to the Atlantic coast, and extends south along the Rocky Mountains and the Appalachian chain. In autumn, millions migrate south, wintering across almost the entirety of the continental United States and northern Mexico, frequently visiting urban and suburban bird feeders.

Feeding Behavior

Juncos are primarily ground feeders. They utilize a characteristic 'double-scratch' technique, hopping forward and then quickly springing back to scratch away leaves, pine needles, or snow to uncover hidden seeds and insects. They often feed in loose, active flocks during winter, establishing a clear social hierarchy.

Vocalizations

• Song: A simple, sweet, metallic trill delivered on a single pitch, lasting 1 to 2 seconds.
• Calls: A sharp, metallic smack or chip contact call, and a high-pitched tsip note given during flight.

Nesting

Nests are typically constructed on or very close to the ground, cleverly hidden under overhanging roots, logs, rock ledges, or dense grass clumps. The female builds a cup lined with fine grasses, roots, hair, and moss, laying 3 to 6 pale, speckled eggs.