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
Silver gull of the silver gull. As is the case with many gulls, it has traditionally been placed in the genus "Larus", but is now placed in the genus "Chroicocephalus". There are three subspecies: The head, body, and tail are white. The wings are light grey with white-spotted, black tips. Adults range from 40–45 cm in length. Mean wingspan is 94 cm. Juveniles have brown patterns on their wings, and a dark beak. Adults have bright red beaks—the brighter the red, the older the bird. Silver gulls are found in all states of Australia. It is a common species, having adapted well