Omissus (Larus argentatus omissus) is a variant of European herring gull. It is largely similar to a common herring gull, but unlike the common species, it has yellow legs.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7e/Gr%C3%A5trut_%28Larus_argentatus%29_-_Omissus_-_Ystad-2020.jpg/220px-Gr%C3%A5trut_%28Larus_argentatus%29_-_Omissus_-_Ystad-2020.jpg)
There is very little research and documentation about the omissus variant, some authors believe that it may be a species of its own.
Omissus can be confused with the Yellow-legged gull, but the omissus does not have as distinctly bright yellow legs as the yellow-legged gull.
Omissus was first described in 1928 by the Russian ornithologist Theodor Pleske