I purchased 12, 3 week old guinea keats 7 weeks ago. I have kept them in their own run, separate from the chicken run. Man, those things can grow. They look full grown but I know they can't be. I have a flock of 125 sheep w/2 guardian dogs & 5 guardian donkeys so I also have a flourishing tick herd, hence the guineas. How long do I need to keep them up before I turn them loose? Sounds crazy, but I was told they will kill a snake. Any truth to that? Hate a snake!