General Description
A rare migrant in Washington, the Bar-tailed Godwit is distinctive in its breeding plumage. It has an unstreaked, rufous breast, dark legs, and mottled brown back. The head is lighter rufous and black, and the bill is long with a slight up-curve. In winter plumage, the Bar-tailed Godwit is mottled gray-brown overall. Juveniles and adults in non-breeding plumage can be difficult to distinguish from the more common Marbled Godwit. The Bar-tailed has relatively shorter legs and longer wings than the Marbled, and a very pale whitish lower breast and belly. When the Bar-tailed is standing, the wing-tips extend beyond the tail. The female's bill is longer than the male's. Rarely seen spring birds are typically in breeding plumage, while fall birds are usually in non-breeding plumage. Many are juveniles, especially during the latter part of the migration period.
Habitat
Bar-tailed Godwits nest in rolling tundra with hummocks and low shrubs. During migration and winter, they are found in tidal mudflats along the coast.
Behavior
Range-wide, Bar-tailed Godwits are typically found in large flocks during migration and winter. In Washington, they are usually seen singly or in flocks with Marbled Godwits. They forage by walking slowly and probing deep in the mud with their long, sensitive bills. The female has a longer bill and can forage in deeper water than the male.
Diet
On the breeding grounds, insects are the main diet, supplemented at times with seeds and berries. In coastal areas, Bar-tailed Godwits eat crustaceans, mollusks, worms, and other aquatic invertebrates.
Nesting
Bar-tailed Godwits first breed at the age of two. Males defend territories and attract mates with an aerial display high over their nesting habitat in the tundra. The nest is located on the ground, often on a raised hummock. The nest itself is a shallow scrape lined with grass, moss, and lichen. Both parents help incubate the four eggs for about 21 days. The young leave the nest soon after hatching, and the parents lead them to a marshy area where they find their own food. Both parents tend and protect the young, which fledge at about 30 days.
Migration Status
Bar-tailed Godwits nest across Europe and Asia, and a population has crossed the Bering Strait and nests in Alaska. They are long-distance migrants, wintering from Southeast Asia south to Australia and New Zealand. During migration some birds may wander to the coasts of North America.
Conservation Status
The Canadian Wildlife Service estimates the worldwide Bar-tailed Godwit population at 1,345,000 birds, with 100,000 of those nesting in North America. Reports of this rare visitor have been increasing in Washington, but it is not known if this is a true increase, or a reflection of increased observation. (The number of wintering Marbled Godwits also seems to be increasing.)