Worthen's Sparrow

Worthen's sparrow (Spizella wortheni) is a species of American sparrow that is endemic to northeastern Mexico. It was first described by Robert Ridgway in 1884 and named for the American naturalist Charles K. Worthen. This small bird has been listed as endangered by the IUCN since 1994. Worthen's sparrow is endemic to northeastern Mexico and currently occupies a 25 km2 range. Populations formerly occurred in Zacatecas, Coahuila, Nuevo León, and Tamaulipas; however, presently it is only known to occur from southeastern Coahuila to western Nuevo León.