Rob Drummond / Silver Gull (Larus novaehollandiae) flying, Victoria, Australia

Gary Bell/ Oceanwide / Silver Gull (Larus novaehollandiae), Heron Island, Great Barrier Reef, Queensland, Australia

Ernie Janes / Silver gull (Chroicocephalus novaehollandiae) on beach Victoria, Tasmania, Australia.

Mark Carwardine / Red-billed gull (Larus novaehollandiae) in flight overhead, Stewart Island, New Zealand, June

Juergen Freund / Silver gull (Chroicocephalus novaehollandiae) flock on beach, Queensland, Australia.

Rob Drummond / Silver Gull (Larus novaehollandiae), Victoria, Australia

Tui De Roy / Silver / red-billed gull (Chroicocephalus novaehollandiae) nesting, Phillip Island Nature Park, Victoria, Australia, December.

Tui De Roy / Silver / red-billed gull (Chroicocephalus novaehollandiae) calling, Phillip Island Nature Park, Victoria, Australia, December.

Pete Oxford / Hartlaub's gull / King gull, (Chroicocephalus hartlaubii) Hout Bay harbor, Western Cape, South Africa.

Pete Oxford / Hartlaub's gull / King gull, (Chroicocephalus hartlaubii) in harbour. Hout Bay harbor, Western Cape, South Africa.

Greg Oakley / Silver Gull (Larus novaehollandiae) with fish prey, Victoria, Australia

Simon Bennett / Silver Gull (Larus novaehollandiae), New South Wales, Australia