Laguna de Santa María, Chihuahua, Mexico.
Formerly included within A. occidentalis, and was thought to be merely a colour morph, but the two forms were found to mate assortatively, and to use different advertising calls to attract their mates; hybrids in areas of contact seem to be rare. Name clarkii was first applied to a smaller southern race, including birds of both “colour morphs”, now classified as A. o. ephemeralis and A. c. clarkii. Distribution limits of all four races in the complex are not well established. Validity of race transitionalis has been questioned#R. Two subspecies recognized.
Food and feeding
Status and conservation
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