Western Olivaceous Warbler

The western olivaceous warbler (Iduna opaca), also known as the isabelline warbler, is a "warbler", formerly placed in the Old World warblers when these were a paraphyletic wastebin taxon. It is now considered a member of the acrocephaline warblers, Acrocephalidae, in the tree warbler genus Iduna. It was formerly regarded as part of a wider "olivaceous warbler" species, but as a result of modern taxonomic developments, this species is now usually considered distinct from the eastern olivaceous warbler, Iduna pallida. == Characteristics == It is a small passerine bird, found in dry open country, including cultivation, with bushes or some trees. 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. Its body length is about 13–14 centimetres (5.1–5.5 in), wingspan 18–21 centimetres (7.1–8.3 in) and weight 8–13 grams (0.28–0.46 oz). 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…