Overview
The Green Ameiva (Ameiva ameiva), often called the Giant Ameiva or South American Ground Lizard, is a fast-moving, brightly colored whiptail relative native to open woodlands and savannas across Central and South America. Renowned for its energetic, high-speed foraging behavior and striking two-toned coloration, this diurnal lizard is an essential predator of ground arthropods across the Neotropics.
Biology and Physical Characteristics
Adult male Green Ameivas display breathtaking coloration: the head, neck, and forequarters are brilliant emerald green, transitioning abruptly around mid-body to rich earthy brown or reddish-tan decorated with irregular black markings and rows of white-ringed ocelli along the flanks. Females and juveniles exhibit more subdued brownish hues with cream lateral stripes. Their legs are muscular and slender, and their whip-like tail accounts for more than two-thirds of their total body length.
Behavior and Ecology
Green Ameivas are heliothermic diurnal hunters that require substantial solar radiation to achieve high operational body temperatures (often between 38 and 40 degrees Celsius). Once warmed, they sprint restlessly across open leaf litter, flicking their long forked tongues and using their front claws to dig vigorously for buried beetle larvae, roaches, and spiders. They are exceptionally swift runners, darting into thick brush or subterranean burrows at the slightest hint of danger.
Conservation and Human Impact
Assessed as Least Concern by the IUCN, the Green Ameiva is extraordinarily common and adaptable, thriving in disturbed secondary habitats, agricultural clearings, and urban parklands. An introduced population established in southern Florida in the mid-20th century continues to thrive in suburban canals and disturbed sandy lots.
Interesting Factoid
The Green Ameiva maintains one of the highest active body temperatures of any reptile on Earth, sprinting across blistering Neotropical sands at near-mammalian internal temperatures of 40 degrees Celsius (104 degrees Fahrenheit).