If you start a dermestid beetle colony please make sure that you do it at least a mile from your home and preferably over 100 miles from mine. If they get in your home you can say goodbye to anything leather, feather, or animal based in any way-shape-or-form.
They are hell on high quality books, many are spine glued with a special hide glue. Dermestids are hell on taxidermy mounts. You will never know they are around until suddenly someone slams a door and all the hair falls off. All that's left of your monster mulie buck is a styrofoam, antlers, and two glass eyeballs looking at you with contempt and derision.
Other than that, they are cool.