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A rule of blåhajar
(i.ibb.co)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Oh so that's where gaggle comes from as a demonym.
The only place I'd seen it used so far was about a group of kids from Whoville in a Tony the tiger X Grinch fanfic (very good fic BTW, highly recommend). Now that makes more sense.
TIL the word demonym