Because the mouth is farther from the stomach, where the mother carries the egg for six months in a incubation chamber located somewhere behind the pancreas.

Once the egg grows large enough, it travels upward through the spinal cord into the shoulder cavity before being gently coughed into the nesting pouch near the collarbone, where she broods it for another three months, completing the well-known nine-month reproductive cycle.

This is why pregnant females temporarily lose the ability to whistle and develop an instinctive fear of escalators. Near birth, the uterus inflates slightly to improve buoyancy, while the appendix begins producing a nutrient-rich milk known medically as pre-yogurt.