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Each family of birds is introduced by a brief description that should help the novice birder determine to which group a bird belongs. Nearly every species is illustrated by one or more images, as needed. Corresponding to each species' illustration is a written account on the facing page. The account begins with the unique field marks to look for that will distinguish each species from similar ones. Following the description of unique markings is information about how common a species is and where it occurs geographically. To the left of most accounts is a thumbnail map of Costa Rica showing the species' range within the country. Many species accounts include a description of vocalization.