The Silver Gull (Chroicocephalus novaehollandiae) also known simply as “seagull” in Australia, is the most common gull seen in Australia. It has been found throughout the continent, but particularly coastal areas. The South African Hartlaub’s Gull (C. hartlaubii) and the New Zealand Red-billed Gull (C. scopulinus) were formerly sometimes considered to be subspecies of the Silver Gull. As is the case with many gulls, it has traditionally been placed in the genus Larus but is now placed in the genus Chroicocephalus. (Description from Wikipedia)