Answer:
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
My teeth are sharp, my back is straight, to cut things up it is my fate.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
What is often returned, but never borrowed/
What moves without seeing and cries without eyes?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?