What bird is that? — A Reader’s Guide

The Seasonal Framework

Chapman's introduction describes a museum exhibit that is revised at the start of each month: 'Permanent Resident Birds' form the base, while migratory species are added or removed as they come and go. The book applies the same logic. In January, the reader only considers birds that winter in the region; in June, only summer residents and migrants. This structure is not merely a convenience—it reflects Chapman's belief that 'the season of occurrence thus gives us an important clue to a bird's identity.' The excerpts show entries for species such as the White-throated Sparrow, which is listed as a common winter visitor in Washington from March 18 to May, and again from September 15 to December 16. By consulting the appropriate seasonal section, the user immediately eliminates hundreds of species that are not present at that time of year.

Reading the Species Accounts

Each entry follows a compact, data-rich format. A typical account begins with a case number and figure references to the color plates, then lists key field marks in a single sentence. For example, the Tree Sparrow is identified by 'a dusky spot in the center of the breast and a reddish brown cap and streak behind the eye.' Length and range are given next, followed by a table of arrival and departure dates for specific locations: Washington, Ossining, Cambridge, N. Ohio, Glen Ellyn, and SE. Minnesota. These local records, drawn from decades of observation, allow the reader to gauge whether a sighting is early, typical, or late for their area. A short paragraph then describes the bird's habits, song, and call notes—the White-throat's 'characteristic sharp clink' or the Tree Sparrow's 'merry chatter.'

The Role of the Color Plates

Edmund J. Sawyer's 301 color illustrations are integral to the identification process. The text repeatedly directs the reader to specific figures: 'Case 2, Figs. 45, 46; Case 4, Fig. 40' for the White-throated Sparrow. The transcriber's note explains that clicking on diagrams and full-color illustrations in the digital edition shows a larger version. Chapman assumes the user will compare the bird in hand with these plates, and the written descriptions are designed to supplement, not replace, the visual information. For species with seasonal plumage variation, such as the Chipping Sparrow, the text notes differences between summer and fall: 'in the fall and winter the crown is like the back, the line over the eye is brownish, and the bill is brown; but the gray rump ... is a good character the year around.'

Using the Book in the Field

Chapman intended the book to be a 'pocket museum'—portable enough to carry on walks. The seasonal arrangement means a reader can flip to the current month and browse only the relevant species. The range data also helps distinguish similar birds: the White-crowned Sparrow, for instance, is described as 'rare enough in the Eastern States, always to command our attention,' and its migration dates are narrower than those of the abundant White-throat. The book does not assume prior knowledge; the opening diagram teaches basic plumage terminology. For a first-time user, the most efficient approach is to note the date and location of a sighting, then turn to the corresponding seasonal section and scan the plates and descriptions for a match.

Chapman's method—combining seasonal restriction, precise range data, and visual reference—makes What Bird Is That? a tool for active learning rather than a passive encyclopedia. Readers who follow the seasonal clues and compare field marks against Sawyer's plates will find the identification process streamlined, even without prior ornithological training. The book rewards careful attention to the details of plumage, song, and timing that distinguish one species from another.

I found myself thinking of that old field guide’s patient month-to-month lists—one bird sliding into the next, grey junco yielding to goldfinch—and then, softly, I remembered the Myology and Serology of the Avian Family Fringillidae: A Taxonomic Study — Context and Discussion. The way it weighs muscles and blood rather than feathers felt like a deeper, slower echo of that same careful watching.