I was wondering which of these two species would be better to keep if you have never kept shelducks before. We have many different species of ornamental waterfowl and I would like to try shelducks. Any information on their habits and requirements would be greatly appreciated, I've done a lot of research but would like to know as much as possible. I know the ruddies are more aggressive so they would need there own pen. Can commons be kept in a big collection? Thanks