Why do animals have tails?
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The presence of tails in animals can be traced back to their evolutionary origins from aquatic fish. Tails served as a means of steering and maneuvering in water. The common ancestor of all land animals, the sarcopterygii, was an aquatic fish species. Over time, this lineage diverged into two groups: the lungfish and the tetrapodomorphs, which includes all land-based animals.
The tail persisted in these animals because it provided practical advantages. However, as humans evolved, our reliance on tails diminished, rendering them no longer beneficial. Consequently, humans lost their tails over the course of evolution.