1. (noun) red-billed seagull, Larus novaehollandiae scopulius, black-billed gull, Larus bulleri - a grey-and-white gull found mainly on the coast, with back and wings pearly-grey except for black wingtips with small white patches. The red-billed also has red legs, while the black-billed gull has black legs and a longer, thinner black bill.

(Te Pihinga Study Guide (Ed. 1): 2;)