To help them moo-ve.
But looking at their skeletal structure, the spine actually inclines at an angle as you move towards its tail. This is the thoracic curve. However the way its vertebrae align from the spine give the illusion that it is straight and parallel.
It is thought that this gives better center of gravity, alleviating the weight from rear hips, better front shoulder support, and even act as a “cooling mechanism” in hot weather. Think of it like a computer heatsink displacing heat a CPU generates.
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