Junco

The “snowbird”

In northern parts of the U.S. and Canada, dark-eyed juncos appear at backyard feeders in late fall and disappear in spring — a regular seasonal visitor associated with snow. The name “snowbird” predates English usage, with similar concepts in many indigenous North American languages. Folk wisdom holds that juncos arrive ahead of the first snowfall.

In reality, junco arrival timing tracks daylight more than weather, and many populations don’t migrate at all — staying year-round in mountains and northern forests.

Many “species” in one

Dark-eyed juncos display dramatic regional plumage variation. The major forms — once classified as separate species — include:

• Slate-colored (eastern North America) — uniform dark gray.
• Oregon (western U.S.) — black hood, brown back, pinkish flanks.
• Pink-sided (Rocky Mountains) — gray hood, broad pink flanks.
• Gray-headed (southwestern U.S.) — pale gray with a rufous back.
• White-winged (Black Hills) — bold white wing bars.
• Red-backed (Arizona) — bright rufous back.

DNA analysis showed all forms can interbreed and produce fertile offspring; they were lumped into a single species in 1973. Where forms meet, hybrids are common.

Ground specialists

Juncos forage almost exclusively on the ground, hopping through leaf litter to find seeds. They’re attracted to the spilled seed under birdfeeders rather than eating from the feeder itself. Most yards in winter have more juncos in the leaf litter beneath feeders than at the feeders themselves.

Tail-flash signaling

Juncos have white outer tail feathers that flash conspicuously when they fly. The flash serves as a flock-coordination signal — when one junco bolts at a perceived threat, the visible tail feathers tell others which direction to flee.