Chimpanzee siluetti 11 months 0 Monkey face siluetti 11 months 1 Monkey face siluetti 11 months 2 Monkeys siluetti 11 months 4 Chimpanzee head siluetti 11 months 0 Chimpanzee face siluetti 11 months 0 Monkey siluetti 11 months 10 Chimpanzee siluetti 11 months 3 Monkey siluetti 11 months 0 Monkey is holding a heart balloon siluetti about 1 year 2 Simpanssi siluetti about 1 year 11 Simpanssi siluetti about 1 year 7 Simpanssi siluetti about 1 year 3 Simpanssi siluetti over 1 year 17