Finding Your Wings. Most serious identification guides assume you can examine the plumage of a bird in hand. Peterson has shown that an observer in the field can learn to identify birds by using distinctive key features - field marks, such as a stripe on the face, the color of the breast, or white tail feathers. This is a workbook. It contains specific questions and exercises, requiring you to look at certain points in the field guides or to go out and make certain observations.
