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OK, now I am confused about what is "upper" web and what is "lower." I was originally thinking "upper web" would be the leading edge of the feather (the skinny webbing) and "lower web" would be the trailing edge of the feather (the wider webbing on a primary, for example). Now I'm thinking "upper" is the outside of the feather when the wing is held against the body, or the top of the wing side if the bird were in flight - and "lower" is the underside of the wing. Clarification would be appreciated. Does "lower" = "underside"?
Sarah
Sarah, I, too, was confused by the terms "upper" and "lower" web and which was which. I went to my SOP and looked at the pictures of the Silver Penciled feathers and then went and looked at the written description of Silver Penciled to see which was which. The lower web is the more narrow one. When the wing is folded up against the body, the lower web is indeed lower. That is how I remember it.