Bird Profile

Common Redpoll

A tiny arctic finch with a red cap and a black chin that can survive 65 below zero. In the winters redpolls come south, they arrive in flocks and go straight for nyjer.

The Common Redpoll is a sparrow-sized finch of the far north, streaked brown and white, with a small red patch on the forehead, a black chin, and a short conical yellow bill. Males carry a rosy wash across the breast that can be strikingly pink on older birds. They breed on arctic tundra and in the northern edge of the boreal forest, and most winters they stay there.

Some winters they do not. When the birch and alder seed crop across the north fails, redpolls pour south in flocks that can number in the hundreds, and yards in the northern United States that have never seen one get a feeder covered in them. It is the same irruptive machinery that drives Pine Siskins and Evening Grosbeaks, running on a different seed crop.

They are also one of the toughest small birds in the world. A bird weighing about half an ounce (14 g) routinely survives arctic nights, and redpolls have been recorded enduring temperatures near 65 below zero Fahrenheit (54 below zero Celsius). This profile covers identification, the honest version of what an irruption year means, the food and feeders they use, and the disease risk that comes with a dense flock.

How to identify a Common Redpoll#

Three marks do the work. The red forecrown patch, the poll that gives the bird its name, sits right above the bill and is visible at surprising distance. Below the bill is a small, neat black chin patch, roughly the size and shape of a thumbprint. The bill itself is short, sharply conical and yellow, with a dark tip in winter.

Everything else is streaking: brown and buff above, whitish below with dark streaks along the flanks, two thin pale wing bars, and a notched tail. Adult males add pink or rosy red across the breast and sometimes the rump. Females and young birds have no pink at all, just the red cap and the black chin.

Redpolls are highly variable. Within one flock you can find birds that look pale, frosty and almost unstreaked on the rump, and others that are dark and heavily streaked. That variation used to be the basis for splitting them into separate species; it is now understood as variation within one.

Confusion species

The split that actually matters at a winter feeder is redpoll against siskin, because the two often travel together in the same flock. Learn the black chin: siskins do not have one. There is more sorting help in the finch identification guide.

One redpoll, not three#

For most of the last century, North American field guides listed Common Redpoll and Hoary Redpoll as separate species, with Lesser Redpoll recognized in Europe. Birders spent a great deal of effort trying to pick a frosty Hoary out of a flock of Commons, and the results were often inconclusive.

Genomic work has since shown that the pale-to-dark variation is driven largely by a single block of linked genes rather than by separate evolutionary lineages, and in 2024 the American Ornithological Society merged the redpolls into one species, Acanthis flammea. If you have older guides, the Hoary Redpoll in them is the same bird as the pale end of your flock.

Where and when redpolls appear#

The breeding range is circumpolar: arctic and subarctic scrub, tundra edge, and the northernmost boreal forest across Alaska, Canada, Greenland and northern Eurasia. In an ordinary winter, birds move only as far south as they need to and stay within the boreal zone.

In irruption winters, flocks push into southern Canada and the northern tier of the United States, most often from December through March. The northern Great Plains, upper Midwest, Great Lakes and New England see them most; in a big year they reach the mid-Atlantic and the central states. Numbers thin sharply the farther south you look.

The driver is seed supply, particularly birch and alder catkins. Redpolls specialize in these small seeds, and when the catkin crop fails across a wide area the flocks move. Cold weather by itself does not bring them: a savage January in Iowa with a good northern birch crop produces no redpolls at all.

Winter finch forecasts published each fall gather cone and catkin crop reports and predict broad movements. They are worth reading and they are genuinely informative, but they cannot tell you about your yard. Flocks are patchy and mobile, and a good regional forecast still resolves to luck at the level of a single feeder.

What Common Redpolls eat#

Away from feeders the winter diet is dominated by birch and alder seeds, taken directly from the catkins while the birds hang upside down like chickadees, plus the seeds of spruce, willow, grasses and weeds. In summer they add insects, and nestlings get a diet with a substantial insect component alongside regurgitated seed.

At feeders the preference is for small, high-oil seed that suits a small bill.

Nyjer is worth buying fresh for a redpoll winter. It dries out and loses oil in storage, and a flock that finds stale seed will move on. Buy a quantity you will use in a few weeks rather than a sack that sits until spring.

The feeder setup redpolls actually use#

Redpolls feed in dense, restless flocks that cycle constantly between the feeder, the ground and a nearby perch. The setup that works gives them multiple surfaces at once.

• A tube or mesh nyjer feeder is the core of it. Mesh or sock feeders let many birds cling at once, which suits flock feeding better than a six-port tube.
• A platform or tray feeder with fine sunflower chips gives the flock somewhere to spread out.
• Ground feeding matters more than people expect. Redpolls forage under the feeder constantly, so clear a patch of packed snow or set out a low tray.
• Two or three feeders spaced apart reduce crowding and squabbling. See running multiple feeders.
• Open water is a real draw in freezing weather, covered in winter water.

Expect mess. A flock working nyjer scatters a great deal of seed and hull, and by March the ground under a busy feeder is a mat of black chaff. That mat holds moisture and bacteria, so rake and remove it rather than letting it build; the general approach is in dealing with seed mess.

Behavior worth knowing#

Redpolls have expandable pouches in the esophagus where they can store seed temporarily. A bird can fill up quickly at an exposed feeder, then fly to shelter and swallow at leisure. It is an adaptation to feeding fast in dangerous cold, and it explains the frantic pace at a feeder: birds are loading, not lingering.

They are also snow burrowers. On arctic nights, redpolls tunnel into soft snow and roost under the insulating layer, in tunnels that can run more than a foot (30 cm) long. Combined with dense plumage and a high metabolic rate, this is how a 14 g bird survives temperatures that would kill most songbirds.

In flocks they are remarkably tame. Redpolls that have never met people often ignore an observer standing a few feet away, and they will sometimes keep feeding while you refill the feeder next to them. Enjoy it, but do not encourage hand feeding; habituated birds fare worse around cats and roads.

They hang upside down freely, which is why mesh and sock feeders work so well. If your nyjer feeder has ports designed for upright perching only, a flock will still use it, just less efficiently.

Nesting#

You will almost certainly never see this. Redpolls nest on arctic tundra and in northern scrub, building a low cup of twigs and grass in a dwarf willow, alder or spruce, sometimes on the ground under a tussock. The lining is typically fine plant down and feathers, often ptarmigan feathers, packed thickly enough to insulate eggs against subfreezing air.

Clutches are usually 4 to 5 pale blue-green eggs with fine dark spotting, sometimes more. The female incubates for around eleven days and the young leave the nest roughly twelve days after hatching, a fast schedule that fits a short arctic summer. Pairs are loosely colonial rather than strongly territorial.

There is nothing to offer them in a backyard. Redpolls do not use nest boxes and they do not breed anywhere near most feeders.

Population and conservation#

Redpolls are abundant across an enormous circumpolar range, and they carry no conservation listing. Assessing their trend is genuinely difficult, though, because standard breeding surveys barely reach arctic nesting habitat and winter counts swing wildly with irruption cycles. Some long-term analyses suggest a decline; the confidence intervals are wide, and it is honest to say the picture is unclear.

The concrete risk in your yard is disease. Dense finch flocks feeding shoulder to shoulder on shared surfaces are a well-documented setting for salmonellosis, and redpoll and siskin irruptions have coincided with outbreaks in multiple winters. Birds that look puffed up, sluggish and reluctant to fly are the warning sign.

Two smaller hazards are worth naming. Redpolls forage on roadsides for grit and spilled grain and get hit by vehicles, and tame birds in a flock are easy targets for cats. Keeping cats indoors, as covered in cats and birds, removes the one you control completely.

A redpoll setup that works#

• A mesh or sock nyjer feeder with fresh seed, hung where a flock can spread across it.
• A tray of fine sunflower chips alongside, plus a cleared ground area below.
• Feeders spaced a few feet apart so a hundred birds are not funneled onto one perch.
• Weekly cleaning and disinfection while the flock is present, not the usual fortnightly routine.
• Open, heated water if your winters freeze hard.
• The discipline to shut it all down and wait if any bird looks sick.