Baird's Junco is restricted to oak and pine-oak forests of the Sierra de la Laguna, at the southern tip of the Baja California Peninsula in Mexico. This distinctive junco has been classified, as different times, at a subspecies of "Oregon Junco"(Junco oreganus, now included in Dark-eyed Junco Junco hyemalis), as a subspecies of Yellow-eyed Junco (Junco phaeonotus), or as a separate species. Baird's Junco has yellow irides, in common with Yellow-eyed Junco, but its cinnamon brown back and cinnamon buffy flanks are superficially similar to some subspecies of Dark-eyed Junco (such as "Pink-sided Junco" Junco hyemalis mearnsi). Genetically, however, Baird's Junco is well differentiated from both Yellow-eyed and Dark-eyed juncos, and its song also is clearly distinguishable from songs of other juncos. The nest is a cup placed on the ground or low in a tree, and the clutch is two. Otherwise relatively little is known about Baird's Junco, although presumably its natural history is similar to that of other species of junco. Baird's Junco is named after Spencer Fullerton Baird, a 19th century American naturalist and Secretary of the Smithsonian Institution.