This Caspian Gull has relative long pale yellowish legs. Most often when seeing cachinnans the thinner legs and the longer tibia compared to argentatus is quite obvious. The eye is relative dark and when seen at some distance due to colour and small size it stood out in contrast to argentatus. The bill is relative long and without pronounced gonys angle. It has a good cachinnans jizz with high push up breast and long slim elongated rear. Additionally the upperparts are slightly darker than nearby argentatus.
In flight the hand is slender and when seen from underneath the black primary markings create a classic cachinnans boomerang because of the extensive grey tongues, black reaching p5 with a broad black band and p10 has all white outer tip. The white apical spots are all relative small.