"Amphisbaenians
Amphisbaenia manni, like many amphisbaenians, is responsive to low frequencies, below 2,000 Hz, with sensitivity of 50 dB at 1,000Hz. When the extrastapes was severed in amphisbaenians, the airborne sensitivity dropped to 30 dB, but that made no difference on the amphisbaenians ability to detect and respond to groundborne (somatic) vibrations, transmitted though the tissues of the lower jaw. The front tip of the lower jaw is most sensitive. Amphisbaenians, not surprisingly, share some other features of hearing - detecting groundborne vibrations - with snakes. See the section on Snakes below for more information.
Chelonians
In those species studied, they respond to low frequency sounds in the 50-1,500 Hz range, similar to that of crocodilians. Aquatic species studied show some difference from terrestrial species. For example, Clemmys guttata (spotted turtle) shows a peak sensitivity of 4 dB at 80 Hz, while Geochelone carbonaria (red-footed tortoise) exhibits a much lower sensitivity, with a peak of 50 dB at 300 Hz.
Crocodilians
As with chelonians, they respond to low frequency sounds in the 50-1,500 Hz range. They are not restricted to sound vibrations picked up by their ears or even their jaw bone. In addition to this sensory equipment, crocodilians have apical pits on the scales of their face and bodies which are sensitive to vibrations traveling through water. For more information on this, see Adam Britton's Crocodilian Biology Database > Integumentary Sense Organs.
Lizards
Most of the lizards for whom data has been collected show that most hear in the same range as does the green iguana (Iguana iguana), whose picks up sounds in the 500-4,000Hz range, with a peak sensitivity at 700 Hz, equal to about 24 dB. With fossorial forms (such as Holbrookia maculata) (lesser [Northern] earless lizard) and others lacking a tympanic membrane, hearing is limited to lower frequencies and requires louder sounds (stimulation) to be detected. Other eared species, such as Gerrhonotus (alligator lizards) have both high sensitivity over a wider range, while others, such as the Lepidophyma sylvaticum (Madrean tropical night lizard), has the high sensitivity but over a smaller range in the lower frequencies. Gekkonids who vocalize have both high sensitivity and high frequency, up into the 10,000Hz range.
Snakes
When mechanical vibrations are applied to the body, they result activation of the inner ear just as do airborne vibrations detected by the tympanic membrane and extrastapes do in eared reptiles. Responses to groundborne vibrations are low in sensitivity and frequency, in the 50-1,000Hz range; their peak sensitivity is at 200-300 Hz range, superior to cats. Like the crocodilians, and other reptiles with linkages of their inner ear structures to their jaw and other structures in the head and throat, snakes have another way to conduct sound to their ear. Vibrations picked up by mechanoreceptors in the skin of their bellies (and bodies?), and possibly their venter, are transmitted to the quadrate via the spinal nerves and from there into their inner ear structures. In other words, most snakes can hear a person speaking in a normal tone of voice in a quiet room at a distance of about 10 feet (3 m). So, if you think your snakes recognize their names, you are probably right. Researchers debate whether the snake's receptors cannot tell the difference between airborne or groundborne (somatic) stimuli, but that higher level processing could enable the snake to tell if the stimulus was airborne or groundborne.
Tuatara
These earless reptiles show a frequency response from 100-800 Hz, with peak sensitivity at 40 dB at 200Hz.
And this means...?
In comparison, human hearing is in the range of 20-20,000 Hz, with intensity at roughly 120 dB. The approximate threshold of pain is 130 dB, with a rock concert coming in at 130 dB, and hearing damage occurs at >90 dB Normal conversation is between 60-70 dB The typical background noise in a classroom is 20-30 dB A motorcycle going 5 mph is about 100 dB, busy traffic 70 dB, rustling leaves 20 dB, and a human breathing normally is 10 dB.
Groundborne vibration sensitivity has not been well studied in terrestrial or arboreal lizards and chelonians. It would not be surprising to learn that they, too, have some mechanism by which vibrations detected when they are are recumbent on a branch or, in the case of chelonians, on the ground."
www.anapsid.org/reptilehearing.html
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