lARUS vEGAE Documentation: Photographs: 19 Sep 2026 Pawnee Lake SRA, Lancaster Co by Tobin Brown (https://ebird.org/checklist/S395550836). Status: Record currently under NOURC review. Taxonomy: Current considerations suggest treatment of the four groups now generally recognized within traditional Herring Gull as separate species (Hebert et al 2024): L. argentatus European Herring Gull, L. smithsonianus American Herring Gull, L. vegae […]
Trumpeter Swan x Whooper Swan (hybrid)
Cygnus buccinator x CYGNUS cygnus Status: Accidental in winter Record: A single bird was observed and photographed at Gavin’s Point Dam, Cedar Co 7 Dec-1 Jan 2026 (Gregory Pavelka, eBird.org). Comments: The photographs show a yellow ill-defined but fairly extensive yellow patch on the bill of an otherwise Trumpeter-like adult swan (eBird Checklist – 17 […]
[Mourning Warbler x Common Yellowthroat (hybrid)]
Geothlypis philadelphia x GEOTHLYPIS trichas Status: Hypothetical. Record: See eBird Checklist – 1 Jun 2025 – Burchard WMA). The single record is of a bird singing a perplexing song at Burchard WMA, Pawnee Co 1 Jun 2025 that sounded much like a Mourning Warbler, but the only bird known to be present was a Common Yellowthroat, […]
EASTERN WARBLING-VIREO
Vireo gilvus Status: Common regular spring and fall migrant statewide. Common regular breeder east and east-central, uncommon west-central and west. Documentation: Specimen: UNSM ZM6789, 26 Apr 1901 Lancaster Co. Taxonomy: AOS split the former Warbling Vireo into two species based on a proposal by Cicero (2025) noting the two groups differ in several ways including […]
WESTERN WARBLING-VIREO
Vireo swainsoni brewsteri Status: Rare spring and fall migrant west (pending further documentation of this newly split species). Documentation: Specimen: UNSM ZM6788, 23 May 1900 Monroe Canyon, Sioux Co (brewsteri) (Bruner, handwritten annotation in his copy of Bruner 1896 in possession of WRS; Brogie 2026). Taxonomy: AOS split the former Warbling Vireo into two species […]
YELLOW-RUMPED WARBLER
Setophaga coronata Five subspecies are recognized (AviList 2025), three north of Mexico: hooveri of Alaska and northwestern Canada, wintering to western US and Central America, coronata of south-central and southeastern Canada to northeastern US, wintering through southern US to Central America and Caribbean, and auduboni of southwestern Canada and western US, wintering to western Honduras. […]