Scientists at the Fauna Communications Institute in Hillsborough, NC, studied several cat species including the domestic cats. They found that the frequency of purring is between 20 and 50 Hertz. Apparently, these “healing” frequencies create bone growth, muscle growth, and pain relief. Since cats purr during extreme emotional situations including contentment and pain, it makes sense that it is more that just a vocal expression. Lions, cheetahs, ocelots, pumas, servals, and caracals all purr. Other studies have shown that in rabbits, frequencies of 25 and 50 Hertz appeared to promote bone strength and quicken the healing of fractures.
Feline bones heal more quickly than any other animal’s. Cats commonly survive falls of seven stories or more although they suffer severe injuries.
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