Part2 (11)Because they adult chimpanzees are far too dangerous and unpredictable. (12)The chimpanzee had a big grin of his face, (raised him,?)patted him on the back ,and calmed Jan van Hooff down. (13)That the people were surprised by how human-like the expressions and gestures of Mama were. (14) He describes it as a very big colony with 25 individuals. He also said that there were power struggles. (15)He presented the evidence that even when de Waal was one of (one amongって言った)the hundreds of visitors, Mama picked him up (from the many peopleった)and came up to him to meet him.