A BIRD IS ITSELF A bird could never be mistaken for a dog or a lizard or a butterfly. A bird is simply a bird. Although there are many kinds of birds, they look and behave so much alike you can always tel lthem from other animals.But they're very informative:
VANE. Looks like thin silky material lined with fine grooves. Really, it is made of two fringes of barbs, one growing out from each side of the shaft. Each barb branches into two rows of tiny branchlets. Hooks and notches on the branchlets fit together and lock each barb to its neighbors. It is as if the barbs were all zippered together to make a covering without holes.I'm not sure how you'd print these out frugally, but they're fun to look at on the computer.