The Pacific Gull (Larus pacificus) is a very large gull native to the coasts of Australia. The adult is black-backed gull with a massive yellow bill, broadly tipped with scarlet. The upper wings and wingtips are wholly black with a narrow white inner trailing edge, the tail is white with a broad black band near the end. The legs are yellow to orange-yellow.
Juvenile Pacific Gulls are mottled dark brown with pale face and the bill is pink with a black tip. The juveniles take up to 4 years to gradually gain their adult plummage.
The immatures have dark brown wings, whitish mottled body and a black-tipped yellow bill.
The following images are mostly immature Pacific Gulls (note the black tipped bill with yellow tip). There were no adults in sight.
Below is an image of an adult Pacific Gull sourced from Wikipedia. You can see how very different they are...
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