The purr is a kind of characteristic snore made by the cats in demonstration of content, it is part of their communication system. It varies depending on the individual (for example, volume and tone) and from one species to another, and can be characterized as a tonal buzz. In domestic cats the purr has a frequency between 25 and 150 vibrations per second.
This particular sound indicates confidence, happiness or well-being and occurs when they feel safe and protected. It is not known with certainty where this sound comes from, which rather constitutes a vibration. Different places have been attributed to it, without exactly locating it.
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