I've attached 4 pics of a thrasher I saw in the Sulphur Springs Valley, SE Arizona last month. I identified it as Bendire's at the time, but have had niggling doubts ever since, not least with the habitat. It was on a fence in the middle of some farmland, with no natural habitat (arid grassland with bushes and yuccas). Is it possible that this bird is within variation shown by Curve-billed Thrasher? Could C-b have young by then (18th April), and what does juv C-b look like? The paintings in Sibley, Peterson and Nat Geographic all differ in the underpart markings of juvs.
Comments very welcome.