Great explanation!IMO, no crow collars are inhumane. There have been a number of posts regarding roos who have been killed while wearing one. They must be checked frequently, the fit must be precise, and they must be continually adjusted to allow for growth of the bird. There is a warning on the instructions about not allowing the bird to eat large diameter items while wearing the collar. I believe they even go so far as to recommend that roos wearing a collar be placed on crumble feed instead of pellets. Any one ever watched a flock of chickens fight over a mouse, a frog or other delectable morsel of mobile meat? I can only imagine the risk to a roo if he tries to hoover a frog while wearing a no crow collar.
If I could not keep a roo and allow him to live like God designed him to live, I would rehome him, or humanely euthanize him. Then, I'd have a wonderful chicken stew.