How cats purr

@article{Sissom1991HowCP,
  title={How cats purr},
  author={Dawn E. Frazer Sissom and David A. Rice and Gustav Peters},
  journal={Nature},
  year={1991},
  volume={349},
  pages={460-460}
}
We measured purring in unrestrained intact pumas, cheetahs and domestic cats. Domestic cats, Felis silvestris f. catus, purr at a frequency of 26·3 ±; 1·95 (S.D.) Hz. The frequency at mid-expiration exceeds that at mid-inspiration by 2·4 ± 1·3 Hz. Purring frequency for individuals does not change with age. Purring can occur simultaneously with other vocalization. Two-channel acoustic measurements confirm that the primary mechanism for sound and vibration production is a centrally driven… 

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