A skull with a foramen magnum positioned at the back of the skull belongs to an individual that is fully bipedal, such as a human.
This is referred to a skeletal structure composed of bones which houses and protects the brain. Bipedal means using two feet for walking while quadrupedal involves using four feet.
A foramen magnum is at the base of the spinal cord which is where the opening where the spinal cord passes through which is common in bipedal such as man.
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