Most people think it because the cat is content and happy. A kitten might purr to communicate to its mum that it’s okay. A cat might purr to communicated to a person that it’s hungry. Cats may also purr when it’s injured or in pain. So, basically they purr to communicate something – it’s said that depending on what they are trying to tell you (they are happy, or they are injured) the purr sounds different.
The laryngeal muscles are responsible for the opening and closing of the glottis (the space between the vocal chords), which results in a separation of the vocal chords, making the purr sound.
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