Randie asked whether it is more hygienic to use glass or water for water bottles. I do not know the answer to that, and it might depend more on how the cleaning is done. Sorry, just don't know, but I have some RELATED INFO. Your question reminds me of something else that I meant to share. In the past there have been worries whether the clear, hard but unbreakable form of plastic might pose health risks from hormonal input of pseudo-estrogens. There is a wonderfully balanced update on research into that in the new September issue of Scientific American which is mainly on "the Future of Privacy". The article begins on page 108 and goes through page 111. Look for the Insights: Toxicology section if you find it in other ways, with the title being "Safety Dance over Plastic" and the author Adam Hinterthuer. (Many book stores and libraries carry Sci Am and libraries which don't can often borrow it from another library or get a given article.) As you will see, the question is far from answered, but the directions to go for refinements in future studies may be known, and the data to date is very interesting. 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 6080]