Feather anatomy

Lesson 3 -Types of feathers // Apologia Zoology 1

I have always loved the look of quill pens and have often wondered what it was like to write with one. When you see the beautiful documents and letters

feather, the component structure of the outer covering and flight surfaces of all modern birds. Unique to birds, feathers apparently evolved from the scales of birds’ reptilian ancestors. The many different types of feathers are variously specialized for insulation, flight, formation of body contours, display, and sensory reception. Unlike the hair of most mammals, feathers do not cover the entire skin surface of birds but are arranged in symmetrical tracts (pterylae) with areas of bare skin…

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