Thomas ChaffeeJuan Heeren

 Oldest found fossils in Kenya  Males can stand up to 1.7m tall  Chimpanzees arms span 150% of body height  Most commonly knuckle walk, also walk on all fours  Reach sexual maturity at 8-9 yr.  Can live up to 35 years in the wild

 Social groups are of mixed sex, with a strict social hierarchy  Male dominant, lead by an alpha male  Male chimps prove dominance by gaining allies  Alpha male displays power by puffing up chest and threatening to charge  Low ranking chimpanzees show respect through submissive body language

 Females have a separate hierarchy  Females pass status through their children  Seek dominant status for mating privileges, and acquiring resources such as food  Groups of high-ranking females can oust an alpha male, replacing him with another

 Chimps use tools to acquire food (and for social display)  They have sophisticated hunting strategies  They can learn to use symbols and understand aspects of human language including some relational syntax  Capable of planning for future events (similar to the gorilla who adopted cat)