A Check-List of the Birds of Idaho — A Reader’s Guide

Structure and Nomenclature

The checklist follows the Fourth Edition of the American Ornithologists’ Union Check-list and its supplements, with occasional departures where Arvey deems a revision “seemingly valid but which has not yet been acted upon by the A. O. U. Committee.” Each entry gives the scientific name, common name, and a brief status note—such as “uncommon resident” or “common migrant”—followed by a specific reference. For example, the Western House Wren is listed as “Common resident” with the voucher “(Univ. Idaho No. 50, Moscow, Latah County, May 25, 1937).” Subspecies are treated separately: the Robin appears as Turdus migratorius with two subspecies, caurinus (Northwestern Robin) and propinquus (Western Robin), each with its own status and specimen citation. This dual-level naming reflects the author’s attention to geographic variation within the state.

Geographic and Ecological Partitioning

Arvey divides Idaho into three regions: southern (Snake River Plains, “characterized by sagebrush desert”), central (wooded foothills extending to Idaho County), and northern (the Panhandle). This tripartite scheme recurs throughout the list. For instance, the Sage Thrasher is noted as “Resident in the sagebrush area from Idaho County south,” while the Western Winter Wren is an “uncommon resident in the Canadian Life-zone of central and northern Idaho.” The author also references life-zones (Transition, Canadian, Boreal) to describe altitudinal and latitudinal ranges. These concise geographic tags allow readers to quickly assess a species’ distribution without consulting a map.

Evidence from Specimens and Published Records

Each entry relies on at least one verifiable source. Arvey uses his own field numbers (prefixed “D. A.”) for specimens he collected, and cites published works by authors such as Merrill, Davis, Rust, and Brodkorb. For example, the Red-throated Loon is documented via “Davis (1935b:234)” and “Rust (1915:121).” The Western Gnatcatcher entry quotes Brodkorb’s record of a specimen taken “about eight miles southwest of Raymond, Bear Lake County” at 6,000 feet. When a species is known only from a single record, Arvey says so explicitly. This careful attribution makes the checklist a transparent compilation of existing knowledge, not a speculative survey.

Language of Provisionality

Arvey repeatedly emphasizes the list’s incompleteness. He calls it “admittedly, a beginning” and hopes it will “stimulate additions to, and corrections of, the list.” Status terms like “uncommon,” “fairly common,” and “common sporadically” are used without quantification. For the Bohemian Waxwing, he notes it is “common sporadically in winter” and cites a breeding record near Sandpoint. The author does not claim to have observed every species himself; many entries rely on others’ reports. This cautious tone—avoiding overstatement—gives the checklist a provisional, open-ended quality, inviting future ornithologists to refine it.

Readers should approach this checklist as a snapshot of mid-20th-century knowledge, not a definitive account. The geographic divisions (southern, central, northern) and life-zone references provide a framework for interpreting the entries, but the author himself stresses the need for further work. Those using the list for field identification will benefit from noting the specimen numbers and literature citations, which offer a trail back to primary sources. Arvey’s restraint—his refusal to speculate on unresolved taxonomy or unconfirmed sightings—makes the checklist a reliable, if modest, foundation for Idaho ornithology.

Years at this desk have taught me that a field guide holds its breath, patient as a heron. A Check-List of the Birds of Idaho waits for someone to notice which wren sang where. Yet Birds in Flight — Edition Insights whispers what the lists cannot — motion, the lift of wings between the printed lines. They keep each other company.