I remember that polecat video from years ago. It was from a Spanish natural history production on polecats if my memory serves. I don't know the history of it, but did learn looooonngg ago about making glass sided burrows for a museum, though I've forgotten these decades later. As I recall, mostly you use concrete with a lot of added pebbles and then some dirt. This one looks more like a covered excavation of an existing burrow with glass slid in, though. Arlena wrote: http://www.youtube.com/watch?v=JgF9JPn2w_E 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/ http://www.ferrethealth.msu.edu/ http://www.ferretcongress.org/ http://www.trifl.org/index.shtml http://homepage.mac.com/sukie/sukiesferretlinks.html all ferret topics: http://listserv.ferretmailinglist.org/archives/ferret-search.html "All hail the procrastinators for they shall rule the world tomorrow." (2010, Steve Crandall) [Posted in FML 6783]