Chimpanzees are the closest organism to human beings both genetically and in their physique. However, chimpanzees are more efficient in their arboreal life - arboreality, human beings are walking on two legs-bipedality, no adaptation for arboreal life. So there will be a common ancestor who is capable of arboreality as well as bipedality. Which organism had such capability, is that organism alive or fossil. Is there perfect fossil evidence to prove that there is a chimpanzee-human common ancestor?.