 It is divided into four subspecies and two allopatric breeding ranges.The westernmost range extends from Nayarit south to southern Oaxaca, whereas the eastern range stretches from the lower Rio Grande valley to northern Querétaro.The most common in the western range are the subspecies "I. g. dickeyae" and "I. g. nayaritensis"; "I. g. graduacauda" and "I. g. audubonii" can be found in the eastern range.