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A common winter bird of eastern woodlots, shuffling about on the ground in loose flocks, often coming to bird feeders that are placed close enough to the shelter of thickets. It is also widespread in the West in winter, but in much smaller numbers. In summer, White-throated Sparrows sing their clear whistles in northern forests. Adults may have head stripes of either white or tan, and scientists have found some odd differences in behavior between these two color morphs.

Among our most familiar birds, the Red-winged Blackbird seems to sing its nasal songs in every marsh and wet field from coast to coast. They are notably bold, and several will often attack a larger bird, such as a hawk or crow, that flies over their nesting area. The red shoulder patches of the male, hidden under body feathers much of the time, are brilliantly displayed when he is singing. Outside the nesting season, Red-winged Blackbirds sometimes roost in huge concentrations.

A typical summer sight is a male American Goldfinch flying over a meadow, flashing golden in the sun, calling "perchickory" as it bounds up and down in flight. In winter, when males and females alike are colored in subtler brown, flocks of goldfinches congregate in weedy fields and at feeders, making musical and plaintive calls. In most regions, this is a late nester, beginning to nest in mid-summer, perhaps to assure a peak supply of late-summer seeds for feeding its young.

This rather tame, active, crested little bird is common all year in eastern forests, where its whistled peter-peter-peter song may be heard even during mid-winter thaws. It is related to the chickadees, and like them it readily comes to bird feeders, often carrying away sunflower seeds one at a time. Feeders may be helping it to expand its range: in recent decades, Tufted Titmice have been steadily pushing north.

Widespread throughout the eastern and central United States, where its rolling calls are familiar sounds in swamps and riverside woods throughout the year. Omnivorous and adaptable, the Red-bellied Woodpecker has also adjusted to life in suburbs and city parks, and in recent years it has been expanding its range to the north. Despite the name, the red on the belly is not often visible in the field. Has been known to be attracted to suet feeders.

Readily attracted to bird feeders for sunflower seeds or suet, the White-breasted Nuthatch may spend much of its time industriously carrying seeds away to hide them in crevices. Its nasal calls are typical and familiar sounds of winter mornings in deciduous woods over much of North America.

One of the most brilliantly colored songbirds in the east, flaming orange and black, sharing the heraldic colors of the coat of arms of 17th-century Lord Baltimore. Widespread east of the Great Plains, Baltimore Orioles are often very common in open woods and groves in summer. Their bag-shaped hanging nests, artfully woven of plant fibers, are familiar sights in the shade trees in towns. This bird was formerly considered to belong to the same species as the western Bullock's Oriole, under the combined name of Northern Oriole.

Rather plain but with lots of personality, the Gray Catbird often hides in the shrubbery, making an odd variety of musical and harsh sounds -- including the catlike mewing responsible for its name. At other times it moves about boldly in the open, jerking its long tail expressively. Most catbirds winter in the southern United States or the tropics, but a few linger far to the north if they have access to a reliable source of berries or a well-stocked bird feeder.

Widespread and familiar (though often called 'crane'), the Great Blue Heron is the largest heron in North America. Often seen standing silently along inland rivers or lakeshores, or flying high overhead, with slow wingbeats, its head hunched back onto its shoulders. Highly adaptable, it thrives around all kinds of waters from subtropical mangrove swamps to desert rivers to the coastline of southern Alaska. With its variable diet, it can spend the winter farther north than most herons, even in areas where most waters freeze.

The popularity of the bluebird has been a boon to the Tree Swallow, which nests in holes of exactly the same size, and has taken advantage of bluebird houses over much of North America. In regions with no such ready supply of artificial nest sites, the swallows must compete with other cavity-nesting birds, arriving early in spring to stake out territories. Unlike other swallows, Tree Swallows eat many berries (especially bayberries), allowing them to survive through wintry spells when other insect-eaters might starve.

This is the most widespread of the three bluebirds. Although it is mostly 'eastern' in our area, the total range of the Eastern Bluebird extends south to Nicaragua. A high percentage of Eastern Bluebirds in North America today nest in birdhouses put up especially for them along 'bluebird trails.' When they are not nesting, these birds roam the countryside in small flocks.

This is the most widespread and familiar large hawk in North America, bulky and broad-winged, designed for effortless soaring. An inhabitant of open country, the Red-tailed Hawk is commonly seen perched on roadside poles or sailing over fields and woods. Although adults usually can be recognized by the trademark reddish-brown tail, the rest of their plumage can be quite variable, especially west of the Mississippi: Western Red-tails can range from blackish to rufous-brown to nearly white.

Little flocks of Black-capped Chickadees enliven the winter woods with their active behavior and their cheery-sounding chick-a-dee callnotes as they fly from tree to tree, often accompanied by an assortment of nuthatches, creepers, kinglets, and other birds. This is a very popular bird across the northern United States and southern Canada, always welcomed at bird feeders, where it may take sunflower seeds one at time and fly away to stuff them into bark crevices.

The sky-blue upperparts of the male Cerulean Warbler can be difficult to observe in summer: At that season, the birds stay high in the tops of leafy trees in the eastern United States and extreme southern Canada. The bird itself has become harder to observe in recent decades, as its numbers have decreased in parts of its range. Brown-headed Cowbirds, which lay their eggs in this warblers' nests, may be finding their unwitting 'hosts' more easily as forest patches become smaller.

Male Scarlet Tanagers seem almost too bright and exotic for northeastern woodlands. These birds are fairly common in oak forests in summer, but they often remain out of sight as they forage in the leafy upper branches. Sometimes in spring, when the Scarlet Tanagers have just arrived from their winter home in South America, a late freeze will force them out in the open as they search for insects on roadsides or in gardens.

Seemingly not as shy as the other brown thrushes, not as bold as the Robin, the Wood Thrush seems intermediate between those two related groups. It sometimes nests in suburbs and city parks, and it is still common in many eastern woodlands, where its flutelike songs add music to summer mornings. However, numbers of Wood Thrushes have declined seriously in recent decades, focusing the attention of conservationists on the problems facing our migratory birds.