Define and quantify please.
What is the magic formula?
Not really. I personally will only keep animals where my needs and theirs do not collide.
What experiences are you applying to your assessments?
Good discussion if you can provide me with data I do not have. Not everything I have read has proved out to be true. Have you ever done experiments where you have kept animals in natural settings vs clinical ones and determined if it affected eating habits, growth rates, longevity, general health, or mental state?