Phylloscopus borealis
SUBFAMILY
Sylviinae
TAXONOMY
Phyllopneuste borealis Blasius, 1858.
OTHER COMMON NAMES
French: Pouillot borйal; German: Wanderlaubsдnger; Spanish:
Mosquitero Boreal.
PHYSICAL CHARACTERISTICS
4.1–5.1 in (10.5–13 cm); 0.3–0.5 oz (8–15 g). Medium-sized
warbler, olive-green above, yellowish-white below, with a yellow
wash in some plumages. Thin, clean whitish eye line; long
wings with two whitish wing bars.
DISTRIBUTION
Breeds in boreal and subalpine zones from Scandinavia
throughout Asia to Japan and Western Alaska. Winters in
Southeast Asia, Wallacea.
HABITAT
Coniferous, deciduous, and mixed forest in taiga zone. Winters
in open woodlands, rainforest, forest edge, gardens, and mangroves.
BEHAVIOR
Arboreal and active, with quick flight and habit of wing- and
tail-flicking. Usually solitary or in pairs or small family groups.
Territorial; male often defends with song and wing-rattling
displays.
FEEDING ECOLOGY AND DIET
Forages in foliage for insects and larvae, usually high, but occasionally
close to the ground.
REPRODUCTIVE BIOLOGY
Monogamous, occasionally polygynous. Courtship involves
song, wing-rattling and wing-flapping displays. Nest is built by
the female; dome of dry grass and other plant materials with a
side entrance on the ground in thick vegetation. Incubation of
5–7 eggs for 11–13 days by female; fledging takes 13–14 days,
young fed by both parents, brooded by female; young independent
after two weeks.
CONSERVATION STATUS
Not threatened.
SIGNIFICANCE TO HUMANS
None known.
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