Feather These barbules have minute hooks called barbicels for cross-attachment. Down feathers are fluffy because they lack barbicels, so the barbules float free of each other, allowing the down to trap air and provide excellent thermal insulation. At the base of the feather, the rachis expands to form the hollow tubular "calamus" (or quill) which inserts into a follicle in the skin. The basal part of the calamus is without vanes. This part is embedded within the skin follicle and has an opening at the base (proximal umbilicus) and a small opening on the side (distal umbilicus). Hatchling birds of some
Leonard Cohen: Bird on a Wire resolved." A DVD was released in 2010, coinciding with a world tour, and then the film was released theatrically in 2017, premiering in New York City. The film has a score of 79 on Metacritic, indicating generally favorable reviews. Commenting on the 2017 re-release, "The New York Times" said that Palmer captured the tour with a 'keen eye." The film was described as " a worthy time capsule and a must for Cohen devotees," with "occasional meanderings into artiness." Leonard Cohen: Bird on a Wire Leonard Cohen: Bird on a Wire, originally titled Bird on a Wire, is a 1974