 There are differences between knuckle-walking in chimpanzees and gorillas : juvenile chimpanzees engage in less knuckle-walking than juvenile gorillas.
<fluency>  There are differences between knuckle-walking in chimpanzees and gorillas : juvenile chimpanzees engage in less knuckle-walking than juvenile gorillas.
 There are differences between knuckle-walking in chimpanzees and gorillas ; juvenile chimpanzees engage in less knuckle-walking than juvenile gorillas.