You can make a diamond shape that you can go around continuously by holding one direction, but it won't have smooth edges. The wiki page's mention of bumpers and intersections leads me to believe it should look something like this style of Skeletron Arena, but smaller: The extreme left and right ends of the track have been hammered to be "bumper" ...


Nevermind, think I figured out why. They aren't flocking, they're just stuck between a mountain and my house, and can't fly higher than my building to get out.

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