When he was with us, the complexity of his brain never ceased to amaze me. There was one occasion when he caught a cold and could not appear on television. There were so many complaints from his fans that we obtained another small chimp to act as a stand-in. When Congo had recovered from his cold we decided to have both of them together on the next show. My assistant was standing by, holding one in each arm. Congo had been very friendly towards the new chimp, and we anticipated no trouble. Indeed, when I announced that Congo was about to appear, he leaned over towards the other little ape to kiss him. The newcomer protruded his lips for a friendly contact, whereupon Congo bit him hard and drew blood. The injured chimp started screaming and had to be rushed out of the room, leaving Congo as the sole star of the show. What is extraordinary about this incident is the timing of it. Congo waited until the crucial moment to dispose of his rival.