Appearance
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 tail flick.The western olivaceous warbler differs from this species in being larger and having a browner tinge to the upperparts; it also has a larger bill. The eastern olivaceous warbler sometimes has a greenish tinge to its upperparts, and can be very difficult to separate from Sykes's warbler, "Iduna rama". The song is a fast nasal babbling.
Naming
Keyserling and Blasius gave no explanation of the genus name "Iduna". The specific "pallida" is Latin for "pale".Reproduction
The eastern olivaceous warbler breeds from southeastern Europe and the Middle East to western Asia, and the subspecies "reiseri" is thought to be locally common as a breeding species in southeast Morocco. Two or three eggs are laid in a nest which is placed low in a bush or in undergrowth.References:
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