Willow Ptarmigan

The Willow Ptarmigan is a plump, hardy grouse of the far north and one of nature's great quick-change artists. Twice a year it molts its entire wardrobe, trading warm, barred reddish-brown summer plumage for pure snow-white winter dress, so that it stays camouflaged whether the tundra is green or buried under drifts. Densely feathered legs and toes work like built-in snowshoes, spreading its weight so it can walk across soft powder, and on bitter nights it dives into a snowbank and lets the snow itself act as insulation.

It has an enormous circumpolar range, from Alaska and Canada across Scandinavia and Siberia, wherever willow scrub, tundra, and moorland meet. In Britain and Ireland its famous dark form, the Red Grouse, skips the white winter plumage entirely and is the icon of heather moorland. The species is also a rarity among grouse in its family life: the male stays with the female through incubation and helps defend the chicks, sometimes throwing himself at foxes and hawks to buy his brood time. Alaska chose the Willow Ptarmigan as its state bird, a fitting tribute to a species that thrives where few others can.

The Willow Ptarmigan is a stocky, chicken-like ground bird whose appearance changes completely with the seasons, which makes timing part of identification. In summer, males are rich chestnut-red on the head, neck, and breast with white wings and belly; in winter both sexes are almost entirely white except for black outer tail feathers. During spring and fall molt, birds look patchy, part brown and part white, matching a landscape of melting or arriving snow. In every plumage the small head, short black bill, and low, rounded body shape mark it as a ptarmigan, and its habit of freezing motionless before exploding into whirring flight is classic grouse behavior.

Male vs. female

In the breeding season, males and females look strikingly different. The spring male molts his head, neck, and breast into rich chestnut-red while his body is still largely white, creating a bold two-toned bird that struts and displays in the open with swollen red eye combs. The female molts earlier and more completely into finely barred brown and buff, a cryptic pattern that makes her nearly invisible while sitting on the nest. Her eye comb is small and often hidden.

By midsummer the male has grown browner overall, though he usually stays more richly rufous than the intricately barred female. In winter identification by sex becomes very difficult, since both are white; the black lores shown by winter male Rock Ptarmigans are not a feature of Willow Ptarmigan, so a white ptarmigan with a plain face and a heavy bill is best sexed by behavior or not at all.

Juveniles

Willow Ptarmigan chicks hatch covered in yellowish down marked with bold dark stripes and blotches, superb camouflage among tundra grasses, and they can walk and feed themselves within hours. Remarkably, they grow flight feathers so fast that chicks can flutter short distances at roughly one to two weeks old, long before they reach adult size.

By late summer, juveniles resemble a small, dull version of the adult female, barred brown and buff with white wings, and they can be tricky to pick out of a family covey. They undergo their first molt into white winter plumage during their first autumn, after which young birds look essentially like adults.

The Willow Ptarmigan does not sing in the usual songbird sense; instead the male delivers one of the most distinctive sounds of the northern spring, a loud, staccato, laughing rattle usually written as go-back, go-back, go-back-back-back. In Britain the Red Grouse's version of this call is so well known that the bird is often said to be shouting at intruders to turn around. Males give it from low perches and hummocks and during dramatic display flights, rising steeply on whirring wings, then gliding down while rattling out the call.

Both sexes also produce a range of low clucks, purrs, growls, and barking notes used between mates and to gather chicks, and a hen with a brood gives soft, anxious calls while feigning injury to lure predators away. On a still spring evening on tundra or moorland, the guttural chorus of displaying males can carry for a surprising distance.

The Willow Ptarmigan has a vast circumpolar range spanning the northern reaches of two continents. In North America it breeds from western and northern Alaska across arctic and subarctic Canada to Labrador and Newfoundland; in Eurasia it ranges from Norway, Sweden, and Finland across northern Russia and Siberia. The distinctive Red Grouse subspecies occupies heather moorland in Britain and Ireland.

Unlike the Rock Ptarmigan, which favors high, barren, stony ground, the Willow Ptarmigan sticks to lower, brushier country: shrubby tundra, willow and birch thickets along rivers and lake edges, muskeg bogs, and the transition zone where forest gives way to open tundra. Most populations are resident or make only short movements, but in harsh winters flocks shift southward or drop into sheltered valleys and river corridors where willow buds remain above the snow. In central Canada some populations move hundreds of kilometers between tundra breeding grounds and wintering areas at the forest edge, with females typically wintering farther south than males.

Adults are almost entirely vegetarian, and willow is the crop that keeps them alive, hence the name. Through the long winter they feed heavily on the buds, twigs, and catkins of willow and dwarf birch, coarse, woody fare that few other birds can process. A large crop and a long, muscular gizzard, aided by swallowed grit, let them grind down this fibrous diet, and they spend much of a short winter day simply filling the crop before roosting.

In summer the menu broadens considerably to include fresh leaves, flowers, seeds, horsetails, and an abundance of berries such as crowberry, bilberry, and cranberry, often gleaned from the low tundra mat. Chicks are the exception to the vegetarian rule: for their first couple of weeks they eat mostly insects, spiders, and other invertebrates, a protein-rich diet that fuels their extremely rapid early growth before they shift to plant foods.

Willow Ptarmigans are mostly monogamous, which is unusual in the grouse family. In spring the male claims a territory with rattling calls and flight displays, and the pair bond holds through the season. The nest is a shallow scrape on the ground, lined with grasses, leaves, moss, and a few feathers, and tucked beside a hummock or under low willow or birch cover where the sitting hen's barred plumage renders her almost invisible.

The female lays a large clutch, usually 6 to 10 heavily blotched reddish-brown eggs, and incubates alone for roughly three weeks. What sets this species apart is the male: he stands guard nearby throughout incubation and then helps defend the chicks, attacking or distracting predators as formidable as gulls, foxes, and even humans who wander too close. The downy young leave the nest within a day of hatching, feed themselves under both parents' watch, and can flutter off the ground within about two weeks. Families often merge into larger coveys by autumn. If the first clutch is lost early, the hen may lay a replacement, but only one brood is raised per year.

The Willow Ptarmigan is not a backyard bird, so the goal is not attracting one but going where it lives. The good news is that within its range it is often common, approachable, and easy to see, since it relies on camouflage rather than flight and will frequently let you watch from a respectful distance. Here is how to find one.

• Visit Alaska, one of the most reliable places on Earth for the species; Denali National Park, the Nome road system, and tundra along the Dalton and Denali Highways are classic spots, and it is the state bird.
• In Canada, look for them in Churchill, Manitoba, across the Yukon and Northwest Territories, and in coastal Labrador and Newfoundland, wherever shrubby tundra meets willow thickets.
• In Europe, upland Norway, Sweden, and Finland hold good numbers; in Britain you can see the Red Grouse form easily on heather moors in Scotland, northern England, and Wales.
• Time your trip for May and June, when males in chestnut-and-white plumage display in the open and give their go-back calls, making them loud and conspicuous.
• Search willow and birch scrub along rivers, lake shores, and the forest-tundra edge rather than bare rocky summits, which belong to the Rock Ptarmigan.
• In winter, scan willow patches poking above the snow for feeding flocks, and watch for lines of grouse tracks and snow burrows; a white bird against white snow often betrays itself only by its black tail when it flies.

• Rock Ptarmigan: Smaller and grayer in summer with a slimmer black bill; prefers higher, rockier ground, and winter males show a black eye-line the Willow lacks
• White-tailed Ptarmigan: A smaller alpine ptarmigan of western mountains whose tail stays all white in every season, unlike the Willow's black outer tail feathers
• Ruffed Grouse: A forest grouse of similar size with a fan-shaped banded tail and small crest; it lives in woodland and never turns white in winter