Here are some photos of G BB Gulls in action:-
http://en.wikipedia.org/wiki/File:Gull_attacking_coot.jpg
http://www.flickr.com/photos/18232677@N00/369344540/
http://www.flickr.com/photos/14939179@N00/914737676/
http://www.flickr.com/photos/jggilbert/1895025407/
http://www.flickr.com/photos/suerob/341040027/
http://www.flickr.com/photos/lbricephoto/3076764250/
http://www.flickr.com/photos/tinyfishy/2490774652/
http://www.flickr.com/photos/omarrun/3102509461/
http://www.flickr.com/photos/sjohanna/2389134929/
some excellent photos of G B B Gulls preying on others, with birds of prey....
http://en.wikipedia.org/wiki/File:Gull_attacking_coot.jpg
http://www.flickr.com/photos/18232677@N00/369344540/
http://www.flickr.com/photos/14939179@N00/914737676/
http://www.flickr.com/photos/jggilbert/1895025407/
http://www.flickr.com/photos/suerob/341040027/
http://www.flickr.com/photos/lbricephoto/3076764250/
http://www.flickr.com/photos/tinyfishy/2490774652/
http://www.flickr.com/photos/omarrun/3102509461/
http://www.flickr.com/photos/sjohanna/2389134929/
some excellent photos of G B B Gulls preying on others, with birds of prey....