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The olive warbler is a medium-sized warbler, 13 to 14 cm (5.1–5.5 in) in length and weighing 9.5 to 12 g (0.34–0.42 oz). It shows clinal variation in size, with more northern populations being larger than southern ones, a phenomenon known as Bergmann's rule. [6] The olive warbler is a long-winged bird.
The brown gerygone (Gerygone mouki), previously known as the brown warbler, is a small passerine bird native to eastern coastal Australia. The upper parts of the brown gerygone are a deep olive-grey or olive-brown, while its face and underparts are a much paler grey, cream, or washed-out brown. The tail feathers are dark and may be white-tipped.
It is a medium-sized warbler, more like a very pale reed warbler than its relative the melodious warbler. The adult has a plain pale brown back and whitish underparts. The bill is strong and pointed and the legs grey. The sexes are identical, as with most warblers, but young birds are more buff on the belly. It has a characteristic downward ...
Swainson's warblers are a small and rather nondescript songbird, though are fairly large for a New World warbler. Adults grow to 12.5–16 cm (4.9–6.3 in) in length and 11–20.5 g (0.39–0.72 oz) in weight. The wingspan averages 23 cm (9.1 in). [3] [4] They are a plain olive-brown above and pale yellow-white below. They have a whitish ...
Two or three eggs are laid in a nest in low undergrowth or a bush. Like most warblers, the western olivaceous warbler is insectivorous. It is a medium-sized warbler, more like a very pale reed warbler than its relative the melodious warbler. The adults have a plain pale brown back and whitish underparts. The bill is strong and pointed and the ...
A willow warbler is a small, round bird with olive green top feathers and pale yellow feathers on the chest. It has pale legs and a stripe of yellow over each eye. It is around 4 – 4.9 inches ...
Wilsonia warblers are 12–13 centimetres (4.7–5.1 in) long. They have yellow underparts and black head markings in at least the adult male plumage. Two species have plain olive green-brown back, but the Canada warbler has grey upperparts and is also migrates much further than the other species in the genus.
There could fewer than 1,000 coastal black-throated green warblers left in the wild, according to the Center for Biological Diversity petition, which also says conservative estimates top out ...