Reptiles
Greater Earless Lizard
Cophosaurus texanus · also called greater earless lizards
Across an open, sun-baked desert flat too hot for most animals to bother crossing, a greater earless lizard sprints between patches of shade, curling its black-barred tail upward in a quick signal before vanishing again, all without a single visible ear to hear a threat coming.
Overview
The greater earless lizard, Cophosaurus texanus, is a fast-moving lizard native to rocky and gravelly desert flats across the southwestern United States and northern Mexico. Its complete lack of visible ear openings and remarkable sprinting speed make it one of the more physically distinctive small reptiles of the American desert.
Built for speed in the hottest hours
While most desert animals retreat from the midday heat, the greater earless lizard uses exactly that window to its advantage, relying on raw sprinting speed across open ground it can have almost entirely to itself.
Status
Least Concern — widespread and stable across suitable rocky and gravelly desert habitat throughout the southwestern United States and northern Mexico.
Greater Earless Lizard: common questions
Why doesn't the greater earless lizard have visible ears?
The greater earless lizard has no visible external ear opening at all, with its tympanum, the internal hearing structure, covered entirely by scales rather than left exposed the way most other lizard species have it, a genuine sensory adaptation that gives the species its common name.
How fast can a greater earless lizard run?
A greater earless lizard can sprint across open desert ground at remarkable speed for its size, ranking among the faster lizard species found in North America, a useful ability for both escaping predators and chasing down quick-moving insect prey across exposed terrain.
Why does the greater earless lizard wave its tail?
A greater earless lizard frequently curls and waves its tail, displaying the distinctive black bars near its base, a visual signalling behaviour thought to communicate with rivals or potentially deter predators by drawing attention to a body part the lizard can better afford to lose.
When is the greater earless lizard most active?
The greater earless lizard remains active during the hottest parts of the day, a period when many other desert animals retreat to shelter, tolerating heat levels that give it access to open ground and prey with comparatively less competition from less heat-adapted species.