For birders who cut their teeth on Roger Tory Peterson's Field Guide to the Birds, that book seemed definitive, like the King James Bible or Bogart and Bergman in Casablanca. But it's a new millennium, and David Allen Sibley and the National Audubon Society have produced an impressive new Guide to Birds.

How does it differ from earlier guides? When Sibley himself was asked, he replied: "My book relies much more on illustrations.... I believe the average field guide user spends the vast majority of time looking at the pictures, and when I was developing this layout I based it on the premise that most of the text in current field guides is redundant.... I wanted a book that would condense a huge amount of information into a portable size, and at the same time make the information ¿patterned,' logical, and accessible to any reader."

He delivers. Full-color paintings--6,600 of them--show us 810 North American species in an array of shapes, stages, colors, markings and poses (at rest, in flight, perched, swimming and so on). Raptors are shown from below. All significant plumages are depicted: the Laughing Gull, for example, is shown in six different stages. Voice descriptions (songs, flight calls, juvenile begging cries, threats, displays) appear on every page. Full-color range maps show complete distributions, migration routes, and summer, winter and breeding locations. Measurements are there, too: wingspan, length and weight. To facilitate comparison, information and illustrations are arranged in the same way for each species, and birds are shown in similar poses. Happily, the text accompanies the drawings as captions, so you don't have to flip back and forth. Pointers guide your eye to the relevant feature.

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