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
Japanese wood pigeon bright metallic purple. The back and chest have green purple metallic sheen. Bill is longish, narrow and dark. The beak is greenish blue. Tip of the beak is ivory to pale yellow. Fleshy covering on the beak (cere) is small. This species has no sexual dimorphism, the sexes are similar in appearance, but the juvenile has generally paler plumage, with limited or no development of the pale yellow neck patch. Tarsi are red in adults while paler in juveniles. Appears like a crow in flight, with large wings and slightly fanned tail. This bird lives in small islands of the