i Register
In some senses, gullery is marked as archaic. Watch for register when choosing this word.
noun
An act, or the practice, of gulling i.e. trickery, cheating or fraud.
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.