One device in particular that should appeal to readers is the symbol found at the top right-hand corner of each illustration indicating whether the bird pictured inhabits sea, marsh, woods, city or a combination of two or more ecological niches…highly recommended…
— North Shore News , North Vancouver , BC

Unlike the guides used by hardcore birders, this one doesn't try to include hundreds of species in a larger geographical area, so a novice is not overwhelmed with detail.