Crevice Spiny Lizard vs. Yarrow's Spiny Lizard

Both are rock-dwelling spiny lizards with a black collar edged white; they meet in the mountains of southern New Mexico, west Texas and Mexico (records share 30 one-degree squares). A: Boldly ringed with black and pale bands in the Crevice Spiny Lizard; no bold rings: plain or faintly banded, often bluish in the Yarrow's Spiny Lizard. B: Grey to olive with dusky crossbands; the scales not individually outlined in the Crevice Spiny Lizard; each scale pale in the middle and edged black, giving a beaded, lacy look in the Yarrow's Spiny Lizard. C: Big: to 5 in head and body in the Crevice Spiny Lizard; smaller: to about 4 in in the Yarrow's Spiny Lizard. Yarrow's lives in the high mountains of the bootheel (Animas, Peloncillo); the Crevice Spiny Lizard on rock outcrops of lower canyons farther east.

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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