In FML issue 315 Urban F. asked: >Has anyone done any studies into if ferrets converse with each >other using ultrasonics? I haven't heard of any. For what it's worth a search on MEDLINE produced no applicable references. (Searched on ferret(s) and mutations of mustelidae and then crossed it with animal communication or animal vocalization. The couple of hits I got back had nothing to do with ultrasound... in fact, it was more like animal communication on the CELLULAR level (and I don't mean as in cell phones!)). Bill [Posted in FML issue 0316]