The main breeding colour of an adult ivory gull’s plumage is white.
The ivory gull is one of the most distinctive high-Arctic seabirds. Adults have entirely white plumage, a pale yellow bill with a red or yellow tip and dark eyes. Their bright appearance provides camouflage in snowy landscapes and against sea ice, although their black legs and facial details remain visible at close range.
Ivory gulls breed on rocky Arctic coasts and islands, often near glaciers or permanent sea ice. They feed on fish, marine invertebrates, carrion and scraps, and may follow polar bears or other predators to exploit leftovers. Their association with sea ice makes them sensitive indicators of environmental change.
Juveniles look different from adults, with darker markings and mottled plumage. That difference is a common source of confusion when identifying the species. The answer refers specifically to the plumage of an adult during the breeding season, not to every age class.