I have been watching these birds at least for 10 years. Autumn is the favored season for watching these birds. In this season you can see adult, sub-adult, immature and juvenile birds all together. Although there is a subspecies described in Hayfa (Israel) and called P. x. vallombrosae (Bonaparte, 1856), this species is nowadays considered as monotipic, since the Israel birds seem same when compared as series (at the same plumage level) to the Turkish birds. I uploaded this footage for people to compare same species filmed in Israel.
Murat Faik Özçelik