1. Where is this written please?
2. He chooses to do it.
3. He has—and uses—his tail as a safety line, even though he's never needed it in this case.
4. He has never fallen from them, though he has fallen off of plants. In fact, the only times he ever has fallen is off of plants in his enclosure.
5. It would endanger him more if I tried to prevent him from climbing or remove him from the pipe.