Booted Warbler
Iduna caligata
The booted warbler is a small species of warbler, similar in size to a common chiffchaff. It has an undistinguished plumage which is plain greyish brown on the upperparts and paler on the underparts. There is a clear, pale supercilium and a short bill with a dark tip. The jizz shown is of a short-winged rather pot-bellied warbler with a square-tipped tail. This species and Sykes's warbler are challenging to identify.
ID text from Wikipedia, CC BY-SA 4.0
Eastern Olivaceous Warbler
Iduna pallida
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.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Booted Warbler and Eastern Olivaceous Warbler.