The most widespread pink-legged gull in North America, the herring is common in the east and mainly a winter visitor in the west. Hybrids can be locally common (mainly in the wescat). Polytypic.
For starters, Ayyash said, focus on adult birds and get familiar with the most common species. Around here, that means Herring Gull and Ring-billed Gull, both year-round residents. A third ...