- http://www.auburn.edu/academic/class...c6/Topic6.html Comparative anatomy
Good on keratin skin structures - hairs, feathers, horns etc.
All about hairy mammalian skin.
- http://www.earthlife.net/birds/feathers.html The wonder of bird feathers
Fantastic article on bird feathers with great pictures.
- http://en.wikipedia.org/wiki/Skin Wikipedia
Wikipedia on (human) skin. Good as usual, but more information than you need.