Visible from the Venice Beach parking lot overlook of the mouth of Frenchman's Creek. There is a big pond at the creek mouth all the way up Pilarcitos Creek, so few people were on the beach as some of the access points are not available. So hopefully it will not get spooked.
It is like a Western Gull, an adult, with pink legs and a dark back. However the back is darker. It has pale eyes with some brown flecks and some crisp streaking on the head, unlike Western. The legs are brighter almost bubblegum pink. The outer primary has an entirely white tip, not just a white mirror. Also there is a mirror on p9, the next primary in from the outermost. On Western, there is one mirror on the outer one and it does not reach to the tip. Inside of this there are white tongue tips, or half moon shaped bits on primaries where the black meets the slaty gray. They form a series of pale "spots" that creep out along the open wing creating what has been termed the "string of pearls." It has been a while since a classic, adult Slaty-backed Gull has been out on the beach. So it was a nice one to see!