Twin-spotted Spiny Lizard vs. Yarrow's Spiny Lizard
They meet where the desert valleys of southeastern Arizona reach the lower canyons of the mountains. A: A black wedge on each shoulder, not a full collar in the Twin-spotted Spiny Lizard; a complete black collar edged white behind in the Yarrow's Spiny Lizard. B: Grey-brown with two rows of dark blotches in the Twin-spotted Spiny Lizard; each scale pale-edged on dark, like a net in the Yarrow's Spiny Lizard. C: Big: to 5.6 in (14 cm) head and body in the Twin-spotted Spiny Lizard; smaller: to 4.1 in (10.4 cm) head and body in the Yarrow's Spiny Lizard.
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