the answer to normal is YES and No . families differ so much in character ,and individual birds more so . it could well be down to "other factors" like feeding , yet , the only example i can give is .... i have had birds from Wiley (on site) and his were aggresive, my own cousin ,who,s birds will fight you in the box only.and local Scottish birds that are generally quiet .my own family are somewhere in-between . all fed the same , but keep there own family traits ?