Melodious Warbler
Hippolais polyglotta
This is a medium-sized warbler, 12 to 13 cm (4.7 to 5.1 in) in length, and similar to its eastern counterpart, the icterine warbler (Hippolais icterina). The adult has a plain brown back and wings, and yellowish underparts. Compared to the icterine warbler, the upper parts are rather browner and the under parts rather yellower. The bill is strong and pointed and the legs are brown. The sexes are identical, as with most warblers, but young birds are paler on the belly. The song is a pleasant babbling.
ID text from Wikipedia, CC BY-SA 4.0
Olive-tree Warbler
Hippolais olivetorum
The olive-tree warbler is a relatively large warbler species with a long, thick bill which has on obvious orange -yellow lower mandible. The upperparts are pale olive-grey in colour, with a noticeable pale wing panel, while the underparts are mostly whitish. The tail is long and dark grey in colour. It is 18 cm (7.1 in) in length, with a wingspan of 24 to 26 cm (9.4 to 10.2 in) and weighs between 19 and 23 g (0.67 and 0.81 oz). Voice: The olive-tree warbler's call is a deep "chack" note, the song is a fast, gruff and loud, with a cyclical repetition of chacking sounds, interspersed with softer sounds.
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: Melodious Warbler and Olive-tree Warbler.