This adult Caspian Gull has relative long and characteristic pale yellowish legs. Most often when seeing cachinnans their thinner legs and longer tibia compared to argentatus is quite distinctive. It has a good cachinnans jizz with high push up breast, flat belly slightly dropped behind legs and long elongated slim rear. Additionally the forehead and the back are both rather flat. The amount of black on p10 is spot on for chachinnans as the feather tip is all white and a huge grey tongue extends on especially inner web.