Titel: Khnifiss's Cape Gulls

Beskrivelse: Found just before dusk after 2 full days of intensive research. At least, we saw not less than 13 Great Black-backed Gull on the same spot (2nd winter 2, 3th winter 1, subadult/adult 10 togheter with a strange looking 3th/4th winter GBBGull a Cape Gull-like at more than 30 meters). The Cape Gulls of the picture are at 980m from us. Look on the broad trailing edge (best key on the ground to me), the greenish legs and overall apparance of GBBG. They have a small mirror on P10 and a full black on P9 visible only in open wing. Close to GBBG in size but however they looks slightly smaller but bigger than Yellow-legged Gulls. Any comment are welcome ...