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Northern Waterthrush


The Northern Waterthrush (Seiurus noveboracensis) is one of the larger New World warblers. It breeds in the northern part of North America in Canada, and in the northern United States, (in areas including Alaska). This bird is migratory, wintering in Central America, the West Indies, and Florida; also Venezuela, Colombia, and Ecuador. It is a very rare vagrant to western Europe; also other South American countries.

Description

The Northern Waterthrush is a large new world warbler with a length of 1214 cm (5-6 in, wingspan of 2124 cm (8-9 in and average weight between 1325 g On the head, the crown in brown with a white supercilium. The bill is pointed and brown. The throat is lightly streaked brown to black with heavier streaking continuing onto breast and flanks. The back is evenly brown. Sexes are morphologically similar. Young birds have buff, rather than white underparts.

The only species which, among bird watchers, causes confusion with the Northern Waterthrush, is the closely related Louisiana Waterthrush (Seiurus motacilla), which has buff flanks, a buff undertail, and bright pink legs. The Louisiana Waterthrush also tends to have a white throat which displays less streaks than would be found on the throat.

Both waterthrush species walk rather than hop, and seem to teeter, since they bob their rear ends as they move along.

Behavior

On the wintering grounds in Puerto Rico, Northern Waterthrushes leave daytime foraging areas and fly up to 2 kilometers to nighttime roosts. The roosts are often located in red mangrove habitats.Smith et al. (2008)

Northern Waterthrushes winter in 4 main habitats in Puerto Rico: white mangrove, red mangrove, black mangrove, and scrub. Males, which are larger and migrate earlier in spring, prefer to winter in white mangrove, and are able to maintain or gain weight through the winter. Females winter in the other drier and less food-rich habitats. Waterthrushes wintering red and black mangrove can maintain body weight through the winter but lose weight in scrub.

Reproduction

The breeding habitat of the Northern Waterthrush is wet woodlands near water. It nests in a stump or among tree roots, laying three to six eggs, which are cream- or buff-colored, with brown and gray spots. These eggs are laid in a cup nest constructed of leaves, bark strips, and rootlets.

Diet

The Northern Waterthrush is a terrestrial feeder, eating insects, mollusks, and crustaceans found amongst leaf litter.

Vocalization

Its song is a loud swee swee chit chit weedleoo, and its call is a hard chink.

References

Cassidy, James (ed.) Book of North American Birds. Reader's Digest: 1990. ISBN 0-89577-351-1.

Curson, Quinn and Beadle, New World Warblers ISBN 0-7136-3932-6

Stiles and Skutch, A guide to the birds of Costa Rica ISBN 0-8014-9600-4

Smith, J. A. M., Reitsma, L. R., Rockwood, L. L. & Marra, P. P. 2008. Roosting behavior of a Neotropical migrant songbird, the northern waterthrush Seiurus noveboracensis, during the non-breeding season. Journal of Avian Biology 39: 460-465.

External links

Smithsonian Migratory Bird Center

USGS

Picture of Northern Waterthrush in hand

Northern waterthrush ecology

Northern Waterthrush videos on the Internet Bird Collection

Northern Waterthrush photo gallery; VIREO Photo-High Res--(Close-up)

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Northern Waterthrush


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