POUL 1010 Lecture Notes - Lecture 2: Dermis, Naked Neck, Pennaceous Feather
26 Mar 2018
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Document Summary
Seven-foot-long wing span, but its skeleton only weights 4 ounces. Flight of a fixed wing structure like an airplane can be described by differential flow of air over the flat undersurface of the wing and the curved upper surface. Birds smaller than a pigeon: jump and start flapping wings. Birds larger need a running start/start on cliffs. Barbs, barbules, and barbicels make up the vane of contour feathers. Tremendous variation in feather types and structure within an individual bird and between species of birds. Down (for insulation and underneath all the other feathers) Filoplumes (sensory information about other feathers and alerts muscles to change position of feathers) All feathers develop from follicles that are found in certain regions of the body (feather tracts) Once feathers reach full length, it becomes completely dead. Feathers in different parts of the body serve very different functions and accordingly they differ in structure. Some of the functions served by feathers are:
