Descriptions of T. redivivum in John Cassin's 1856 book Illustrations of the Birds of California, Texas, Oregon, British, and Russian America led later ornithologists to conclude that at least three of the birds described were actually the crissal thrasher. When an army surgeon working in New Mexico sent Cassin specimens of a bird that _he_believed to be the California thrasher, Cassin sent the specimens to Spencer Baird at the Smithsonian Institution. <sep>, Pronoun: he <sep>, A: Cassin <sep>, B: Spencer Baird