What Is the Tiny, Restless Bird Flitting Through the Trees in Fall? Identifying Kinglets

You catch the movement before you catch the bird: something impossibly small is flitting through the outer branches, flicking its wings, darting from twig to twig, hovering for a half-second at the tip of a branch and then gone — never still long enough for a good look. It is smaller than a chickadee, rounder than a warbler, and seems to run on pure electricity. In fall, across most of North America, that tiny bundle of motion is almost certainly a kinglet — either a ruby-crowned kinglet (Corthylio calendula) or a golden-crowned kinglet (Regulus satrapa). These are among the smallest songbirds on the continent, and every autumn they pour down out of the northern and mountain conifer forests where they nest, spreading into ordinary woods, parks, and backyards. Here is how to know one, and how to tell the two apart.

How to Identify a Kinglet

Kinglets are tiny, plump, big-headed, short-tailed birds, olive-gray to greenish above and paler below, with a couple of white wing bars. But you will usually notice the behavior before the field marks:

• The size: astonishingly small — smaller than a chickadee, only a hair bigger than a hummingbird, weighing about as much as two pennies
• The motion: relentless, nervous energy — constantly flicking the wings open and shut, hopping between twigs, and hovering at branch tips to pick tiny insects and eggs from the foliage
• The shape: round-bodied, large-headed, and short-tailed, with a thin needle-like bill for gleaning small prey
• The wing bars: two pale wing bars, with a dark smudge just below the lower bar on the ruby-crowned that is a handy clue

If a bird has you thinking "that is too small to be a bird" as it twitches and hovers through the branch tips, flicking its wings the whole time, you are almost certainly watching a kinglet.

Ruby-Crowned vs. Golden-Crowned: Telling the Two Apart

Two kinglet species share our woods in fall, and the difference is written on the face:

• Golden-crowned kinglet: a boldly striped face — a black-bordered crown filled with bright lemon-yellow (flaming orange in the center on males) and a clean white eyebrow stripe over a black eye-line, so the head looks strongly patterned even at a distance
• Ruby-crowned kinglet: a plain face broken only by a bold white eyering that gives it a wide-eyed, "spectacled" look; the red crown patch it is named for is usually hidden and only flares up when the male is excited, so most of the time you will not see any red at all
• The wing-flick: both flick their wings, but the ruby-crowned does it almost obsessively, which combined with the white eyering nails the identification
• The voice: golden-crowned gives very high, thin "see-see-see" notes (so high some people cannot hear them), while ruby-crowned gives a scolding "ji-dit" and, in spring, a surprisingly loud, tumbling song for such a small bird

Bold black-and-yellow striped head means golden-crowned; plain face with a bold white eyering and near-constant wing-flicking means ruby-crowned — and if you glimpse a flash of red on the crown, that seals the ruby-crowned.

Why You See Them Now

Kinglets nest mostly in the spruce and fir forests of Canada, the northern states, and high western and Appalachian mountains, so for much of the year they are out of sight of most backyards. Fall migration changes that. From roughly late September through November, kinglets stream south and downhill, and on the way they forage low and in the open, often in mixed flocks with chickadees, warblers, and nuthatches. Migrating kinglets are famously tame — intent on feeding and easy to approach — so a fall walk is the best chance all year to get close to one. Golden-crowned kinglets are also remarkably hardy, with many spending the whole winter in cold northern woods, surviving nights well below freezing by huddling together and feeding almost nonstop through the short days.

Other Tiny Birds Kinglets Get Confused With

A few other small, active birds share the kinglets’ autumn branches and cause mix-ups:

• Chickadees: similar restless energy, but noticeably larger, with a crisp black cap and bib and a longer tail — and they are far bolder and noisier at feeders
• Warblers (especially fall yellow-rumped): warblers are slimmer and longer, with thinner tails and generally less frantic wing-flicking; the yellow-rumped shows a bright yellow rump patch that kinglets never have
• Blue-gray gnatcatcher: a similar tiny, fidgety bird, but slimmer with a long, white-edged tail that it constantly cocks and flips — more of a warm-season bird in most areas
• Brown creeper: another tiny woodland bird of fall, but it creeps up tree trunks like a mouse and is streaked brown for camouflage, not a twig-tip hoverer like a kinglet

Not sure whether that hyperactive speck is a kinglet, a chickadee, or a fall warbler? Snap a photo — even a quick, slightly blurry one showing the face pattern and wing bars — and let Spotter help you identify it, so you can start telling the tiny birds of autumn apart as they move through.