Silcock & Jorgensen

Sayornis saya saya Status: Common regular spring migrant west, fairly common central, uncommon northeast, rare southeast. Fairly common regular breeder west and southern west central, uncommon southern east central, rare casual east. Common regular fall migrant west, uncommon central, rare casual east. Documentation: Specimen: UNSM ZM6369, 20 May 1900 Sioux Co. Taxonomy: Two subspecies are […]

Tyrannus vociferans vociferans Status: Fairly common regular spring and fall migrant west, rare casual central. Fairly common regular breeder west. Documentation: Specimen: UNSM 6360, 19 Sep 1919 Glen, Sioux Co. This specimen was stated by the collectors to have been taken 9 Sep (Mickel and Dawson 1920). Taxonomy: Recently, Chesser et al (2018) rearranged the […]

Colaptes auratus auratus, C. A. LUTEUS, C. a. COLLARIS (cANESCENS) Status:  “yellow-shafted flicker”: Common spring and fall migrant east and central, uncommon west. Common breeder east and central, uncommon west (Pine Ridge, North and South Platte river valleys). Fairly common winter visitor east and central, uncommon west. “red-shafted flicker”: Common winter visitor (altitudinal movement from Rocky […]

COntopus sordidulus veliei Status: Increasing. Common regular spring and fall migrant west, locally rare west central, rare casual elsewhere. Common regular breeder west, locally rare west central. Documentation: Specimen: UNSM ZM6396, 24 May 1900 Monroe Canyon, Sioux Co. Taxonomy: Four subspecies are recognized (AviList 2025), two north of Mexico: saturatus from southeast Alaska to western […]

Contopus cooperi cooperi Status: Uncommon regular spring and fall migrant east, west, and Platte River Valley, rare elsewhere in central. Documentation: UNSM 6401, 14 Jun 1901 Warbonnet Canyon, Sioux Co. Taxonomy: AOU (1998) noted that this species was previously placed in the monotypic genus Nuttallornis, as N. borealis. Nuttallornis is now merged with Contopus, where […]

Falco peregrinus anatum, F. p. tundrius Status: Uncommon regular spring and fall migrant statewide. Locally uncommon regular resident east, extirpated west. Rare casual winter visitor statewide. Documentation: Specimens: UNSM ZM7696 (anatum) 14 May 1915 Garden Co; UNSM ZM7695 (tundrius) 5 May 1935 near Stapleton, Logan Co. Taxonomy: There are 18 subspecies recognized world-wide (AviList 2025), […]