One summer (August) I was in Bulgaria (Dobrich province) and in the middle of the city I take picture of this bird:
He was making a sound like "Tchek-tchek" like the sound of a
Eastern Olivaceous Warbler (lat.
Iduna Pallida) but the greenish color make me think it is more a
Icterine Warbler (lat.
I found a song similar to the bird I saw on this page (second record).
It could also be a
Common Chiffchaff (lat.
Phylloscopus collybita) or a
Willow Warbler (lat.
Phylloscopus trochilus) as they are very common but the length of the tail make me feel it more one of the above (or another one) and the sound does not seem to fit.
Anyone can help on identification of this bird?