Kelp Gull
Larus dominicanus

Kelp Gulls are also known as Southern Black-backed or Dominican Gulls and can be found around the southern oceans. They are not particularly common in the Sydney region and only started breeding in Australia in the 1940s. Unlike Silver Gulls, they are not so easily approached. Kelp Gulls are superficially similar to Pacific Gulls, but with less massive beaks. They are amongst the largest of the gulls with a wingspan of 128-142 cm and length of 54-65 cm.
 

1-3: Wollongong City Beach, NSW, 09/08/2010.
4-5: South Pacific, off Wollongong, 25/06/2011.