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Adults have darker grey backs and wings than herring gulls, but are paler than lesser black-backed gulls. They have more black in the wing tips than herring gulls and smaller white 'mirrors'. The legs are bright yellow, there is a red ring around the eye and the bill is yellow with a large red spot. In non-breeding plumage, the head is less streaked and whiter than herring gulls. Juvenile yellow-legged gulls are very similar to juvenile lesser black-backed gulls, but tend to be whiter-headed and start to gain a grey 'saddle' on their backs quickly as they moult to first winter plumage.