must be in writing;

may be amended or revoked, by further declaration in writing, at any time;

must designate the extent of any wild bird protection zone or wild bird surveillance zone which is being declared;

must list or refer to the measures which apply in such a zone;

must state to which categories of bird measures apply; and

must be ended by further declaration.

may be amended or revoked, by further notice in writing, at any time;

must specify whether they apply to all or part of a premises.