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*Snakes have no vocal cords, but are able to make hissing noises by passing air through the glottis.
 
*Snakes have no vocal cords, but are able to make hissing noises by passing air through the glottis.
 
*Aquatic snakes have an air sacs which serves as a bouyancy aid.
 
*Aquatic snakes have an air sacs which serves as a bouyancy aid.
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For more information see [[Lizard and Snake Respiration]] and [[Snake Respiratory System]].
    
===Chelonians===
 
===Chelonians===
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