Wiktionary
n. A medium-sized gull, ''Larus canus''.
Wikipedia
The common gull (Larus canus) is a medium-sized gull which breeds in northern Asia, northern Europe and northwestern North America. The North American subspecies is commonly referred to as the mew gull, although that name is also used by some authorities for the whole species. It migrates further south in winter. There are differing accounts as to how the species acquired its vernacular name (see Etymology section below).
Usage examples of "common gull".
From a scattered body of gulls, working slowly against the wind with angled wings, Stephen had picked out what was almost certainly Larus canus, usual enough in the Irish parts of his youth, some of which had been spent in the west, where they nested in quantities on the cliffs and the more lonely strands, but quite rare in these waters, and he was just about to say 'I believe I see a common gull' when Martin asked 'How would you render peripateia?