FEATHERS

design: it-1 316-317; g 3/10 5; g 7/07 23-25; g90 10/22 16

discussion: g 7/07 23-25

measurement of pollution: g 8/08 30

not evolved from reptile scales: g90 10/22 16

ostrich: g99 7/22 18

owls: g 12/09 23; g90 9/22 16-17

preening: g05 2/8 30; g04 4/22 23-24

reflection of UV light: g04 3/22 28-29