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mac version birds convulse on the ground for eternity perfect game ready for release im so excited

Any information you have about this could be very useful!

Do you by any chance get a poor framerate during play?

If so, press Numpad (-) to lower the graphical settings, and see if the birds stand up.

(I have a hypothesis that your issue is due to me accidentally factoring in framerate twice instead of just once for the physics calculation!)