RULE: Black Swift

IF: How did the bird fly = {Swallow-like} OR {Stiff-winged} OR {Erratic} AND
How BIG was the bird = {Sparrow-sized} OR {Robin-sized} AND
<What TYPE of bird was seen> = {ID by Unique Behaviour or Jizz} AND
WHERE was the bird seen = {Southwestern United States} OR {Northwestern Canada or United States}