• It's probably just human-influenced evolution. When they were first discovered in Egypt (I believe); the egyptians would perhaps see the 'purrr' as a sign of health or adorability and so the ones who couldn't purr weren't chosen as pets.
  • This is a theory that I have recently heard about. Source: That fact that the cats in this study produced frequencies that have been proven to improve healing time, strength and mobility could explain the purr's natural selection. After a day or night of hunting, purring could be likened to an internal vibrational therapeutic system, a sort of "kitty massage" that would keep muscles and ligaments in prime condition and less prone to injury. Additionally, the purr could strengthen bone, and prevent osteodiseases. Following injury, the purr vibrations would help heal the wound or bone associated with the injury, reduce swelling, and provide a measure of pain relief during the healing process.

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