contour feather![click to hear](/images/speaker.jpg)
Large rigid feather of the wings and tail enabling flight.
inferior umbilicus ![click to hear](/images/speaker.jpg)
Opening of the shaft located at the lower portion of the calamus; it is implanted in the skin.
superior umbilicus ![click to hear](/images/speaker.jpg)
Opening of the shaft located at the juncture of the calamus and the rachis.
barb ![click to hear](/images/speaker.jpg)
Each of the self-adhering filaments implanted on each side of the rachis.
rachis ![click to hear](/images/speaker.jpg)
Solid corneous upper portion of the shaft of the contour feather; it is an extension of the calamus and the barbs are attached to it.
calamus ![click to hear](/images/speaker.jpg)
Hollow corneous anterior portion of the shaft of the contour feather extending through the rachis.
afterfeather ![click to hear](/images/speaker.jpg)
Small soft light feathers usually located at the base of the main feathers on the abdomen; they help to insulate the body.
vane ![click to hear](/images/speaker.jpg)
All the interconnected barbs on the same side of the rachis forming a waterproof surface.