No Jimmy, that is a gull, and a gull is a seabird, but there is no such bird as a seagull.

Greater Black Backed Gull
Lesser Black Backed Gull
Herring Gull
Common Gull
Then there's
Kittiwakes
Sandwich Terns
Arctic Terns
etc etc.
All are predominantly white, all are found by the sea, and all are referred to, wrongly, as seagulls.
Sorry to be pedantic mate, but it's just one of my pet hates ;)

XG