The position of the foramen magnum at the base of the cranium like this allows primate A to move bipedally face forward rather than with its head tilted upwards which indicates bipedal locomotion.
Bipedal locomotion is a form of terrestrial locomotion in which an organism moves using its two hindlimbs or legs. An animal or machine that normally moves on two legs is known as a biped / ˈbaɪpɛd /. It means "two legs" (from Latin "double" and pes "feet").
Humans are unique among living primates in the way they move. In fact, the bipedal locomotion we do, in which one leg moves in front of the other, is incredibly rare in mammals and the only living creature in this group to move in this way. I am a member.
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