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Be thankful for Birds. Birds are a part of creation that can do things we cannot. FLYing is one of those things.  Their bones are so lightweight that it makes it possible for them to do things that would otherwise be aerodynamically impossible to do.  You cannot imagine how complicated something as simple as a bird feather is.  Until you look at one and then get a magnifying glass and look again. Even better get a 10x hand lense and look again.  And once you have seen how the tiny barbs are connected you are beginning to learn why birds are so wonderful.