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The generalized drawing  of a bird on the following two pages shows the exeternal parts 

of a bird which are mentioned frequently in the species description in this book. Definitions of terms which are not in everyday use may also be found in the dictionary. In addition, you have seen a streamlined sparrow sized bird with a longish bill creeping down the trunk of a maple or other decidous tree. It was grayish blue with a white face black cap and lightcolored breast.