Females give birth to a single young chimp after about 8 months. Young chimpanzees are born helpless and spend the first 6 months clinging to the hair on its mother's chest while she is in motion. From 6 months to 2 years, young chimpanzees ride on the mother's back. They are weaned at 5 years. Young chimpanzees will often stay with their mothers for many years, thus forming a subgroup within the community.
Chimpanzees are very intelligent.
They are able to solve complex puzzles and have even been taught sign language. However, it is unclear whether the chimpanzee understands words as abstract thought or if it is just repeating.