Seagulls are very easy to make yourself, I make mine out of Milliput but a craft type air dried clay would do just as well.... Greater Black Backed gull pinching Milliput fish below and like yours, this is 1:24 scale. :-)
(http://i154.photobucket.com/albums/s253/Artistmike/seagul.jpg)
Actually, same goes for crew come to that, mine have been transferred of late from the Railway to Ship duties {-)
(http://i154.photobucket.com/albums/s253/Artistmike/ealr29.jpg)
(http://i154.photobucket.com/albums/s253/Artistmike/ealr30.jpg)