Wingtag (on left or right wing) with a 2 numeric code.
note 1 : used colours are red, white or yellow.
note 2 : the tag has been attached between the secondaries and tertials or between the first-third secondaries.
note 3 : birds were tagged at the autumn migration '98 in southern (Chokpak Pass, foothills of the Anarchay mountain) or eastern (Sugaty valley, Zaisan-hollow) of Kazachstan.
note 4: 1 bird has been tagged.