All humans develop a tail in the womb that eventually dissolves.
https://en.wikipedia.org/wiki/Human_vestigiality
In the context of human evolution, human vestigiality involves those traits (such as organs or behaviors) occurring in humans that have lost all or most of their original function through evolution. Although structures called vestigial often appear functionless, a vestigial structure may retain lesser functions or develop minor new ones. In some cases, structures once identified as vestigial simply had an unrecognized function.
The examples of human vestigiality are numerous, including the anatomical (such as the human tailbone, wisdom teeth, and inside corner of the eye), the behavioral (goose bumps and palmar grasp reflex), and molecular (pseudogenes). Many human characteristics are also vestigial in other primates and related animals.
Interesting how some monkeys use their tails like a third arm. Useful when living in trees.
Man found the ground to his liking, without a need for a tail. . Evolution at work.