That is a very heavy horned impala. Must be an old timer.
I shot a baboon last month but not really after one. Outfitter and property owner wanted it gone. They can be hell on sheep, especially during lambing which was just starting (they will catch ewes and tear off the udders for the milk). Also, clients were coming to cull a couple cow kudu and the baboon was keeping them off the citrus bait. I filled my list and had a day to kill so outfitter said go shoot the SOB. So I did. He was a nice one. Outfitter wanted the skin and I presume he took the skull.
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Boy, do I really look that old? Time to make a date with Miss Clairol.