1. Reliance on vision, coloured vision, binocular + stereoscopic (3D)
2. Reduced olfaction (smell), no rhinarium aka wet nose
3. Heterodontic, 4 types of teeth
4. Arboreal adaption (hands and feet)
5. Dietary plasticity (varied diet)
6. Extended parental investment, one offspring at a time, time between births
7. Complex social structures (dom male, hierarchy)