This diminutive book with 123 pages of main text on pages 6 × 4.5 inches consists of 24 entries, averaging 4–5 pages, each for one of the day’s 24 hours. Each hour is represented by one species, depicted in a pen and ink drawing by Tony Angell and an account by Mark Hauber that focuses first on a distinctive activity that bird does at that hour, then providing some more general natural history and conservation information. Birds of every continent are present. Nocturnal and crepuscular birds fill the darker hours, active in ways fewer people know or have seen, while the bright hours feature a mix of more familiar foraging and courting behaviors as well as secretive parasitic behavior by Common Cuckoos and Brown-headed Cowbirds, the author’s specialty. A reference list of primary sources from which the information is drawn enables readers to delve further.

As Hauber notes, each of...

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