What are the structural features of the human spine in comparison with animals?

The human spine has bends that soften shocks when moving, and protect the brain and internal organs from concussion; the first two cervical vertebrae have a special structure to bear the weight of the skull; the lumbar vertebrae provide mobility of the spine and have a thickened structure, since the maximum load falls on them when standing upright, and in women, even during pregnancy; the sacrum is fused, forms a support for the pelvic organs; the coccyx is reduced.