18. What is an intermembral (IM) Index? What does it tell us about locomotion? IM Index Formula: (Humerus+Radius)/(Femur+Tibia) x100 Bipedalism - 50-80 Quadrupedalism - 80-100, (Knuckle-walking ~100) Brachiation - 100-150 19. Find the IM index of the human. What is its locomotion? 20. Find the IM index of the chimp. What is its locomotion? 21. Find the IM index of the baboon or rhesus monkey. What is its locomotion?

18. What is an intermembral (IM) Index? What does it tell us about locomotion? ANSWER :- A typical way to describe the relative limb proportions of both contemporary and extinct primates is with the Intermembral Index. The Intermembral Index and the species of primates' locomotor behaviours are approximately connected. With the tiny hominid Oreopithecus from Italy, brachiation—associated with a high intermembral index—was established as a mode of arboreal living at the end of the Miocene. 19. Find the IM index of the human. What is its locomotion? ANSWER :- Since the intermembral index of humans ranges from 6811 to 7011, this indicates that their hind limbs are longer than their forelimbs. Humans have a low intermembral index due to the fact that they only use their hind limbs to move while they are walking on two legs. 20. Find the IM index of the chimp. What is its locomotion? ANSWER :- The intermembral index of chimpanzees is 10612, which indicates that their forelimbs are longer than their hind limbs. Chimpanzees' high intermembral indices are a result of their extensive use of their forelimbs for climbing and arm-hanging/swinging behaviours. 21. Find the IM index of the baboon or rhesus monkey. What is its locomotion? ANSWER :- IM index of the baboon or rhesus monkey 95 – 96. Baboons are specialised for quadrupedal movement in the adult stage, although they may alternatively adopt a number of positional modes, including bipedalism.

18. What is an intermembral (IM) Index? What does it tell us about locomotion? IM Index Formula: (Humerus+Radius)/(Femur+Tibia) x100 Bipedalism - 50-80 Quadrupedalism - 80-100, (Knuckle-walking ~100) Brachiation - 100-150 19.

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