In addition to all the noises they can make with breathing digestion (stomachs growl too) They often make things make noises scales on some plastics make a sounds squeaky scratchy sounds and if everything is correct it can be quite loud. One of mine wedges a plastic hide into the corner and exits from under neath and manages to vibrate the side. It groans hard to describe but the plastic and scales make a deep throbbing low grown it freaked me out until I figured out what it was.
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