Sierra Leone – Chimpanzee Monkey – $1 – 2010 – Brilliant Uncirculated Crown – Chimpanzees are members of the Hominidae family, along with gorillas, humans, and orangutans. Chimpanzees split from human evolution about 6 million years ago and the two chimpanzee species are the closest living relatives to humans, all being members of the Hominini tribe. The male common chimp is up to five and one-half feet high when standing, and weighs as much as 150 pounds; the female is somewhat smaller. The common chimp