Sometimes considered part of a species-group centred on G. passerinum (which see). Formerly considered to include G. californicum, G. cobanense and G. hoskinsii as races, but these recently separated on basis of vocalizations and/or DNA evidence. Perhaps closely related to G. costaricanum, which has recently been treated as conspecific with present species by some authors. Monotypic.
S USA (SE Arizona) S through interior highlands of Mexico (from Chihuahua and Coahuila S to Oaxaca).
Food and feeding
Status and conservation
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