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[[Image:Lizard_ear.bmp|150px|thumb|right|'''Lizard ear (the tympanum is the clear scale in the center)''' (© RVC and its licensors, Sean Bobbit, Sue Evans, Andrew Devare and Claire Moore. All rights reserved)]]  

[[Image:DSC01794.JPG|400px|thumb|right|Green tree monitor closeup with ear visible, at ZSL London Zoo. Clamy, RVC 2010]]  

Most lizards seem to hear in the same range as the [[Green Iguana|green iguana]] (500 to 4,000Hz range), with a sensitivity peak at 700 Hz, equal to about 24 dB. For lizards lacking a tympanic membrane, such as the lesser (Northern) earless lizard (''Holbrookia maculata'') and many fossorial (burrowing) and semi-fossorial lizards (for example the legless Anniella), hearing is limited to lower frequencies. However, even without a surface or subsurface-mounted tympanic membrane, many "earless" reptiles can indeed "hear", though to varying degrees.  

Most lizards seem to hear in the same range as the [[Green Iguana|green iguana]] (500 to 4,000Hz range), with a sensitivity peak at 700 Hz, equal to about 24 dB. For lizards lacking a tympanic membrane, such as the lesser (Northern) earless lizard (''Holbrookia maculata'') and many fossorial (burrowing) and semi-fossorial lizards (for example the legless Anniella), hearing is limited to lower frequencies. However, even without a surface or subsurface-mounted tympanic membrane, many "earless" reptiles can indeed "hear", though to varying degrees.