Overview
The Blue Spiny Lizard (Sceloporus cyanogenys) is one of the most stunning, brilliantly colored reptiles in North America. Inhabiting the sun-scorched limestone canyons and thorn scrub of southern Texas and northeastern Mexico, adult males of this large, armored lizard display dazzling iridescent emerald-blue, cobalt, and turquoise coloration contrasted by a regal white-bordered black collar.
Biology and Physical Characteristics
The Blue Spiny Lizard possesses a broad, flattened body covered in large, heavily keeled and pointed scales that provide rugged defense. While females and juveniles are cryptically patterned in mottled grey and brown with pale cream spots, adult males develop a glorious dorsal wash of shimmering metallic blue-green, copper, and turquoise. Around the neck lies a distinct, bold black collar edged in crisp white scales.
Behavior and Ecology
A saxicolous (rock-dwelling) specialist, the Blue Spiny Lizard is an agile climber that dashes vertically across sheer limestone cliffs. Males vigorously defend prime rocky lookouts, performing push-up displays that flash metallic blue belly and throat patches to warn rival males. When alarmed, it dives into deep rock fissures, wedging its spiny scales against the stone.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the Blue Spiny Lizard is common and secure across its range in northeastern Mexico and along the Rio Grande borderlands, readily colonizing manmade stone structures, rock walls, and road culverts.
Interesting Factoid
The male Blue Spiny Lizard looks like an armored jewel: in bright desert sunshine, his spiny scales shimmer with electric cobalt and turquoise, topped with a tuxedo-like black collar edged in pure white pearls.