A plump, medium-sized shorebird with a very long bill, relatively long legs, and short tail. Breeding adults have black, gold, rufous, and white upperparts with rufous reddish underparts marked with dark scalloping. Nonbreeding adults are grayish above and on the breast, with a pale belly. Fresh juveniles have blackish back feathers neatly edged rufous, buffy, or pale rusty. All plumages show long pale supercilium (eyebrow) and a white back between wings. Long-billed Dowitchers probe deeply into mud or sand with an up-and-down motion likened to the needle of a sewing machine. They tend to forage in water less than about 3 inches deep. On the breeding grounds, males sing from high in the air over the territory. Breeds in wet sedge meadows with small ponds in tundra lowlands and foothills. On migration and in winter, uses ponds, marshes, sewage treatment facilities, and other freshwater environments; less often estuaries, rivers, and tidal flats.
https://www.allaboutbirds.org/guide/Long-billed_Dowitcher/id