I'd say a prime candidate (in fact a certainty) is the Northern white rhino, I've not personally seen one but I'm pretty sure you have Ian!![]()
Its been discussed somewhere on here before but I can't remember the outcome, however I'm presuming that the original White rhino pair at ZSL- 'Ben' and 'Bebe' were both Northerns (then regarded as a subspecies or race). I remember vaguely seeing them in the old Cattle Sheds. 'Ben' of course lived to go into the Casson building with his 2nd (Southern) mate where he was such a familiar sight I never took any special notice of him. Of course, although its nowadays deemed a 'good' species, the Northern is so similiar (virtually identical) to its Southern counterpart it doesn't IMO have quite the cachet of other more inidividualistic species.