The Herring Gulls is a large gull with a hefty bill and robust body. The adult herring gull has light-gray backs and black wingtips. It's head and chest are white. In the winter, it's head is marked with dusky streaks. It takes four years for it's plumage to change and grow into adult plumage. It patrols shorelines and open ocean looking for food. It feeds on fish, marine worms, birds, eggs or insects. It often snatch another bird's meal.