I was sitting in a chair reading and looked up to see Kobe struggling and hanging from the hook of a boing. He was perfectly silent which is unusual for him. I immediately got up to have a look and saw that his toe was caught in the hook. I could not get to him properly so I took the boing and Kobe out of the cage together and managed to release his toe. He is OK and is not even favoring his foot. If there is a hole in something in the cage he seems to manage to find it.
I never noticed this hook was different from all of my others. So please check all of your hooks and be sure it is not the kind that has a small hole on the curve of the hook.