The monotypic Aztec Thrush (Ridgwayia pinicola) is endemic to Mexico (Howell and Webb 1995). It ranges from the mountains of central Chihuahua and Coahuila south to the Isthmus of Tehuantepec, favoring Madrean pine–oak woodland (Conservation International 2008) and pine forest from 1800 to 3500 m elevation (Howell and Webb 1995). Outside Mexico, it is casual in southeastern Arizona and southern Texas (AOU 1998). The secretive nature, irregular distribution, and nomadic habits of the Aztec Thrush make it difficult to study, leading to some uncertainty about its true status over much of its range. Also, little is known about its demography and life history; for example, the nests, eggs, and fledglings have rarely been observed.