Bretrick's post about Steve Irwin reminded me of this clip. Apparently there is some outfit that has a permanent encampment near some Mountain gorilla territory. They teach the visitors how behave so as not to pose a threat. And the guy in this clip was surprised when a family of Gorillas came calling at the encampment and took and interest and apparent liking to one man. Who, it must be noted behaved appropriately, using body language similar to what Fossey used with Gorillas, Goodall with Chimps and Galdikas did with Orangtans. There are longer clips, but this one opens with 3 young gorillas examining a man. At about 18-20 seconds the Silverback moves them just a bit 'off' him. To my eyes it is as much because he realizes it might be uncomfortable for the man as any 'fear' for his youngsters.