Ok, thanks for this question. Almost impossible to answer so I will give my answer using my experience. If you are keeping chickens please remember they are prey animals so always a bit flighty. What I have found (my own personal observation not proven in science) is the larger the breed the calmer the bird. Hence why I prefer large fowl only. Please note crested birds with slightly impaired vision seem to be the most flighty for obvious reasons. I am sure I will get lots of emails telling me how clam your banties are but please remember this is only answered on my experience in poultry keeping. Hope this helps.