The Great Black-backed Gull, the worlds' largest gull, is larger and darker than the Lesser Black-backed, with pink-grey legs (instead of bright yellow).
It is native to north Atlantic coasts of Europe (including the Baltic and Greenland) and America.
Kelp Gull/Southern Black-backed Gull
The Kelp Gull, also called the Southern Black-backed Gull (New Zealand), is the Southern Hemisphere
version of the northern Great and Lesser Black-backed. It's dark colour back looks like the Great Black-backed,
but in size it is between the Great and the Lesser Black-backed. Its common appearance around the coast and its
habits are more akin to the Lesser Black-backed Gulls.
Southern Black-backed Gull with Blue Cod