Russ Prater found the details when they were posted. It seems that some sent to Canada were mis-calibrated to the wrong scale: http://pets.groups.yahoo.com/group/ferrethealth/message/3314 Many thanks, Russ! Sukie (not a vet) Recommended ferret health links: http://pets.groups.yahoo.com/group/ferrethealth/ http://ferrethealth.org/archive/ http://www.afip.org/ferrets/index.html http://www.miamiferret.org/fhc/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html [Posted in FML 5670]