Calotes bachae is distinguished by its prominent nuchal crest and dorsal crest of large, spiny scales. During the breeding season, males undergo a dramatic color change: the head, body, and tail transform into a vibrant ultraviolet-blue hue, while the throat becomes black with bright blue spots. This UV-blue coloration is a key trait separating it from C. mystaceus, whose blue is less intense and lacks UV reflectance. Females and non-breeding males are typically brown or olive with darker markings, providing camouflage. Adults measure 90–110 mm in snout-vent length (SVL), with a tail nearly twice the body length. The species has heterogeneous dorsal scales, a distinguishable tympanum, and well-developed limbs adapted for climbing .
This medium-sized lizard exhibits pronounced sexual dimorphism, particularly during breeding displays. Males develop intense ultraviolet-blue coloring on the head, body, and tail, contrasted by a black throat with electric-blue spots. The crest scales along the neck and back become more prominent and may take on an orange or reddish tint at the base. Females remain predominantly brown or olive with irregular dark cross-bands and a less developed crest. Juveniles resemble females but with finer scaling and more subdued patterns. The ventral surface is generally lighter, ranging from cream to pale yellow. The eyes are large with round pupils, and the toes are long with sharp claws for gripping branches .
Calotes bachae is distributed across southern Vietnam (including Ho Chi Minh City, Cat Tien National Park, and Ba Ria-Vung Tau Province) and eastern Cambodia. It occupies a range of habitats from lowland evergreen forests to secondary growth, agricultural areas, and urban parks. This lizard is highly arboreal, commonly found on trees, shrubs, and man-made structures like fences and buildings. It avoids dense, closed-canopy forests but thrives in open, sunny areas with scattered vegetation. Elevation ranges from sea level to about 500 meters .
Diurnal and Arboreal: Active during the day, it basks in sunlight to regulate body temperature and forages for insects, spiders, and small invertebrates .
Breeding Displays: Males are highly territorial during the breeding season (March–October), displaying their blue coloration to attract females and intimidate rivals. They perform push-up displays and extend their dewlaps to assert dominance .
Reproduction: Oviparous, with females laying 5–15 eggs in moist soil or leaf litter. Incubation lasts 6–8 weeks, and hatchlings are independent immediately .
Diet: Primarily insectivorous, feeding on crickets, grasshoppers, beetles, and occasionally small fruits or flowers .
Anti-Predator Tactics: Uses camouflage when threatened; if cornered, it may bite or drop its tail (autotomy) to escape .
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