About Iduna pallida (Hemprich & Ehrenberg, 1833)
Iduna pallida is a medium-sized warbler. Compared to its relative the melodious warbler, this species more closely resembles a very pale reed warbler. Adult Iduna pallida have plain pale brown upperparts and whitish underparts. Their bill is strong and pointed, and their legs are grey. Like most warblers, males and females of this species look identical. Young birds, however, are more buff-colored on the belly. This species has a characteristic downward tail flick. The western olivaceous warbler, a different related species, is larger than Iduna pallida, has a browner tinge to its upperparts, and also has a larger bill. The eastern olivaceous warbler sometimes has a greenish tinge to its upperparts, and can be very difficult to distinguish from Sykes's warbler, Iduna rama. The song of Iduna pallida is a fast nasal babbling. This is a migratory species that winters in sub-Saharan Africa or Arabia. It occurs as a rare vagrant in northern Europe.
