All of these photos were taken in Hyde Park (Chicago) during the last few weeks, unless otherwise noted.

A third winter herring gull has pink legs but has a black spot on bill that is starting to turn red.

pair of ring-billed gulls (parking lot gulls). Ring-billed gulls have yellow legs and a black spot on their bill. They are 17.5 inches long.

First winter ring-billed gull (note it has pink legs like a herring gull). This photo was taken in August.