Feather development grows, its spathe, which is where the rachis and vanes attach, continues to form. When spathe is finished developing, the calamus begins to form within the base of the spathe. The calamus is the quill of the feather, which is the bottom portion that stays mainly within the pulp cavity. From there, the feather is fully developed and will remain as such until molting occurs, causing it to fall off. Feathers fall off during molting, which occurs in the at different times through the year depending on the type of bird. Birds can molt for seasonal, reproductive and many other
Leonard Cohen: Bird on a Wire Leonard Cohen: Bird on a Wire Leonard Cohen: Bird on a Wire, originally titled Bird on a Wire, is a 1974 documentary that chronicles a troubled 1972 concert tour of Europe and Israel by the Canadian singer and songwriter Leonard Cohen. It was directed by British filmmaker Tony Palmer, with cinematography by Les Young. The film takes its name from the Cohen song "Bird on the Wire". The film, after extensive re-editing from its initial version, opened in London in 1974. It was shown on German television, but it disappeared for decades and was considered a lost film. Its original