Book excerpt: Birdsong by the Seasons is a celebration of birdsong from January through December. The stories begin with a pileated woodpecker on New Year's Day; they unfold through the year, covering limpkins and scrub-jays in February in Florida, prairie birds in May, Scarlet Tanagers in July, and ending with a chorus of singing birds in Massachusetts just before Christmas. Readers get inside the mind of a scientist and see how answers only lead to more questions. Kroodsma provides a unique experience: with his gentle guidance, the pairing of sonagrams with the audio CDs make birdsong accessible and fascinating.