The first humans walked upright but were more apelike than later humans. All humans came from a common ancestor that we share with other apes and monkeys. The next group of humans walked upright more often than the last but they still climbed trees and were very apelike. The first groups of humans had about 50% the brain size of modern people. The next group of humans were more like us but still had ape like qualities and behavior. All of the first humans had lived in Africa an evolved mainly in Africa, but the latest group of humans (the "homo" group) were the first ones to travel ouside and colinize the rest of the world.