RE: What is the most difficult animal you've ever bowhunted ?
Believe it or not,a zebra continues to elude me. I've tried spotting and stalking them for a total of 42 days in Africa -as a daily target of opportunity. AsAfrica's "default" animal (what do I mean by this? If you see a dot on the horizon, chances are it's a zebra), they're very difficult to approach with a bow. They live among the impala, springbok, blesbuck, etc. Eyes are everywhere! Getting close enough for a bow shot is extremely challenging! They rarely come to waterholes during daylight hours.
Axis deer would be my second choice. Then Antelope and blackbuck...