gullery

noun

1. (archaic, countable, uncountable)An act, or the practice, of gulling i.e. trickery, cheating or fraud.
2. (countable, uncountable)A colony of gulls.

   “Gulls seem to fear the great skua less than the Arctic one, and will sometimes mob and molest it. A single pair that had nested on the outskirts of a gullery were a good deal subject to this annoyance.”