One of best places to retrieve early human remains is in caves/sinkholes below where leopards stash their prey high up in the trees today. When the leopard got through with what it wanted, smaller meat eaters and the wind sent the remains into the pit. In one summer season a team in Kenya studied a series of these holes. Something along the lines of 70-80% of skulls found in the holes were hominid, with classic fang punctures in them.
It's safer to imagine you see that leopard in the dark and turn around, than to ignore it, keep tromping on and become leopard chow.