According to various estimates, anywhere from 42 million to 60 million Americans consider themselves bird watchers--birders, to use the preferred term among the faithful. These people spend roughly $20 billion a year on items ranging from seed for backyard feeders to high-priced guided tours in pursuit of rare or exotic species. Only two purchases are required, however, to get started: a pair of binoculars and a field guide, i.e., a book illustrating the identifying characteristics of birds encountered in nature. A good field guide is a bird in the hand.
The late Roger Tory Peterson invented this sort of book with...
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