The wings and back are slightly darker than those of the Western Gull.

The Western Gull has a white head and body, and gray wings.

This species is one of the largest gulls in the world, being slightly larger than the already large Western Gull.

Studies have shown that ten to 15% of female western gulls in some populations in the wild prefer other females.

Among birds, for instance, studies show that 10 to 15 percent of female western gulls in some populations in the wild are homosexual.

The Western Gull is currently not considered threatened.

Western Gulls also will snatch a fish from a cormorant's or pelican's mouth before it is swallowed.

Western Gulls are very aggressive when defending their territories and consequently were persecuted by some as a menace.

A thriving colony of western gulls was decimated by egg collectors who supplied hungry '49ers.

"Territory defense and associated vocalizations of Western Gulls."

Its legs are yellow, though first winter birds do display pink legs like those of the Western Gull.

Figure 2 and 3 describe the relationships observed of many single- or double-brooded bird species, from male western gulls to male turkeys.

Adults are similar in appearance to the Western Gull with a white head, dark, slate-colored back and wings, and a thick yellow bill.

Western Gull colonies also suffered from disturbance where they were turned into lighthouse stations, or, in the case of Alcatraz, a prison.

Western Gulls begin their nesting efforts at the end of April, sometimes making their shallow nests just inches from trails.

At times some Western Gulls can be predatory, preying on the young of other birds and even adults of some species.

It is similar in appearance to the Western Gull and the Glaucous-winged Gull.

The islets of Anacapa also host the largest breeding colony of Western Gulls in the world.

The Western Gull is rarely encountered inland or away from the ocean and is almost an exclusively marine gull.

Western gulls take approximately four years to reach their full plumage, their layer of feathers and the patterns and colors on the feathers.

Western Gull (Larus occidentalis).

Western Gull and Glaucous-winged Gull hybridise extensively in western North America.

The western gull population is on the increase, and significant numbers of black-crowned night herons, small nocturnal hunters, breed on Alcatraz from mid-February to early summer.

The most common species are Western Gull, Glaucous-winged Gull, and California Gull.

It is a close relative of the Western Gull and frequently hybridizes with it, resulting in identification problems-particularly in the Puget Sound area.

Western Gull (Larus occidentalis).

The Western Gull (Larus occidentalis) is a large white-headed gull that lives on the western coast of North America.