Unlike Bird 1, this bird seems to totally lack a dark eyestripe (and has very little supercilium), instead having pale yellow lores and a distinct pale eyering. The head shape and pale lores and face pattern suggest an Acrocephalus or Hippolais warbler, but the greenish-yellow tones rule out the former. This appears to be one of the two greeny yellow Hippolais warblers: Melodious or Icterine. But which one? The main distinguishing feature between the two similar birds is the structure of the wing. Icterine has a much longer wing, with a huge primary extension (like this bird). Icterine also often shows a distinct pale panel running parallel with the wing, as is also shown by this conveniently posed bird, an Icterine Warbler.
KEY FEATURES Yellowish greenish wash to plumage Open face, with pale yellow lores and no dark eyestripe Very long wings, with long primary projection Pale ‘panel’ in wing Hint of dark line above pale supercilium