"Kroodsma, professor emeritus at the University of Massachusetts, shares what he's learned from more than three decades of recording and analyzing the songs of birds in this intriguing, instructional book. Using "sonagrams" (also known as sound spectrograms, they plot a sound's frequency over time), he illustrates the songs of 30 birds, from the familiar American robin to the exotic three-wattled bellbird of Costa Rica. He considers how birds acquire their songs (some species learn them; others have their tunes "encoded somehow in nucleotide sequences of the DNA"), what makes the songs unique, what functions they serve, and how they've evolved. No two species sound alike, of course, but groups of birds within each species have their own dialects, and individual birds have their own repertoires as well. A CD of the bird songs discussed is included, as are descriptions of the recording equipment Kroodsma used and explanations on how to make similar recordings and "sonagrams."...

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