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
A Bird in a Gilded Cage instead of love. Its lyrics are as follows: Bing Crosby included the song in a medley on his album "On the Sentimental Side" (1962). Sylvester Stallone sings the song in his guest spot of "The Muppet Show". Malcolm McLaren produced, together with Bootsy Collins, a cover version of "Bird in a gilded cage" in hiphop style as a bonus track for a release from his album Waltz Darling, The House of the Blue Danube. (1989). Kristin Chenoweth sings the song as Lavinia Peck-Foster in season 2 episode 2 of "Trial & Error". A Bird in a Gilded Cage "A Bird