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earless lizard
Earless lizards are two genera of small lizards native to the semi-arid and grassland habitats of the southwestern United States and Mexico. The genus ''Cophosaurus'' and the genus ''Holbrookia'' are both characterized by having no external ear openings, presumably to prevent sand from entering the body as they dig.
==Defense mechanism==
Earless lizards have a peculiar defense mechanism which is coupled to their cold-blooded life style. They have a small opening on the top of their head called a 'blood sinus' which helps the lizard to gain heat quickly during daytime. However the blood can also be channelized to the eyes of the lizard when a predator looms close by, efficiently spitting 〔http://www.digimorph.org/resources/horned.phtml〕 the blood onto the predator giving it enough time to escape.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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