When I was a about 6 y.o my parents took me to the local Zoo. When we got to the primates section I saw a group of older (human) children who were trying to provoke the chimps and apes by pulling distorted faces while making all kinds of animal like noises however the assorted chimps just sat there motionless staring back blankly. As we were leaving we passed the same area to see a rather subdued Nigger 'Fambly' similarly staring into the enclosure presumably sensing the obvious connection to their jungle borne ancestors. It was then that the chimps must have recognized a reciprocal kinship for they leaped up and down and swung from rope to rope while screeching and grunting all to the amusement of the observing 'Fambly'. My parents also chuckled but I suspect for a different reason.