I have at last found a wing feather about the same size as the Tawny owl feather, I believe it is from a heron. The purpose was to demonstrate in the wing feathers, the difference from a nocturnal owl whose flight is silent and a normal diurnal bird. I hope you can see the softer upper surface of the tawny which seems to have extra coverings over the barbules, which you cannot see, where on the heron you can see the barbules locked together in the herring bone type pattern. The long "ridges" you can see are the barbs. Try this web site for a clear sketch of a feather. http://www.birds.cornell.edu/AllAboutBirds/studying/feathers/feathers

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