If Bird 4 was green, this bird is even more green! The upperparts are a lovely shade of green, contrasting sharply against the silvery white underparts. At the front end, the throat is washed with lemon yellow and the strong supercilium is also strongly washed with yellow. The other most striking feature is the length of wings, with primaries which stretch a significant way down the tail, giving a short-tailed impression. There is no wing-bar, which may make you think of Willow Warbler or Chiffchaff. But neither species has this structure or such a clean white belly. This is their close relative, the Wood Warbler, which is surprisingly scarce on passage.
KEY FEATURES Bright green above, silvery white beneath Very long wings Bright lemon yellow supercilium and throat Tail looks relatively short