Hovering of skylark

　A skylark flaps in the lain down pose. As the methods the downward air current against the gravity is produced by, we consider as the followings. The upward convex wing is vibrated up and down. The wing curvature makes larger in upward run and smaller in downward run. The flapping velocity makes faster in downward run and slower in upward run. It enlarges the flapping down angle and makes the air escape through the separated feathers in upward run. Probably all these methods may be used synthetically. The skylark is the symbol bird of Ibaraki prefrcture. Here we could see its hovering pose from spring to early summer till the Genom analysis center had been built, together with the peculiar tone of the twitering due to the remarkable fluctuation and the changeable wind. (Prod. Apr. 2003, full‐scale, No.2)