Codex on the Flight of Birds of a kite as seeking a wind current. When the winds are high, one will see the bird very high in the sky, but when the winds are low, the bird stays closer to the ground. Leonardo describes how a bird rests in the air, after flapping its wings to gain altitude, by gliding downward to the ground. Folio 6 contains multiple diagrams of birds flying and their bone structure, and all of the commentary is on flight and how birds fly the way that they do. Leonardo starts off by describing how a bird ascends or descends in different
Blue-headed racket-tail Blue-headed racket-tail The blue-headed racket-tail ("Prioniturus platenae"), also known as the Palawan racket-tail and locally as kinawihan, is a parrot found in the western Philippines around Palawan. It inhabits humid lowland forest in small flocks. It is threatened by habitat destruction and limited trapping for the cage-bird trade. The species was formerly considered conspecific with the blue-crowned racket-tail. The blue-headed racket-tail is 27–28 cm long. The plumage is green with a bright, light blue head, blue underwings (except for green coverts) and, in the male, a bluish breast. The beak is bluish gray and iris is yellowish. The species utters