The American Ornithologists’ Union has updated its checklist, splitting Sage Sparrow into Sagebrush and Bell’s Sparrows, with an interior Californian subspecies also earmarked as a future separate species. Other interesting decisions are to not split Cabot’s Tern from Sandwich, to maintain White-breasted Nuthatch as a single species, and to keep the three American rosy-finches a species – these were recently recommended as a ‘lump’.
Chesser, R T, Banks, R C, Barker, F K, Cicero, C, Dunn, J L, Kratter, A W, Lovette, I J, Rasmussen, P C, Remsen Jr, J V, Rising, J D, Stotz, D F, and Winker, K. 2013. Fifty-Fourth Supplement to the American Ornithologists' Union Check-list of North American Birds. The Auk 130: 558-571.