Medium-sized elongated gull. Brown-gray overall with a long bill and dark underwings. Similar to White-eyed Gull, but with dark underwings. Slightly larger and heavier with browner adult plumage than White-eyed Gull. The bill on Sooty Gull is also thicker and clearly two-toned in all ages compared to White-eyed Gull. Coastal, breeds on islands and coral reefs.