When not dreaming of hunting, I work as a veterinary pathologist studying the potential toxicities of various substances (usually pharmaceutical candidates). As far as I can tell, an adult three-eyed deer has never been reported before (at least in the pathology/medical literature). Basically, the best explanation is a congenital defect with partial duplication of the face - a very subtle (and, thus, survivable) expression of a two-headed conjoined twin. Such a defect in humans is also very rare (maybe only one report). When something is that rare, nobody can accurately blame it on anything. After showing something to have a reasonable benefit/safety profile, I advocate a better life through chemistry and biotechnology (in addition to good-living, good-eating, and exercise).
