Kuvaus: Kamchatka Leaf Warbler is split from Arctic Warbler. This individual was photographed from small flock, from where also call was heard. According to article by Saitoh, Shigeta and Ueda ( Species identification to three allospecies of Phylloscopus borealissuperspecies based on morphology-Bull Jpn Bird Banding Assoc 26:45-61 (2014)), the shape and lenght of P1 may be clue for ID. This ind has longish P1 (over 1 mm over primary coverts).