The hierarchy constantly changes and rank depends on intelligence and personality as much as strength. Chimps greet each other affectionately and spend hours grooming friends and family. Reproduction Chimps mature around 13 years and a female will give birth after a gestation of around eight months. The newborn chimp is helpless and relies on its mother for milk. Chimps have long childhoods and are dependent on their mother's care for five years.
Young chimps spend a lot of time playing together and learning how to be a part of chimp society.
Primate Campaign .