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https://www.researchgate.net/profile/Robert_Eklund/publication/267222117_An_acoustic_analysis_of_purring_in_the_cheetah_Acinonyx_jubatus_and_in_the_domestic_cat_Felis_catus/links/55dd1ca408ae83e420ee5d03.pdf (2010)
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http://www.sciencedirect.com/science/article/pii/0006899387910079 (1987)
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http://www.sciencedirect.com/science/article/pii/014067369291839Z (Lancet)
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http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2907.2002.00113.x/abstract (2002))
Captions provided by CCTubes – Captioning the Internet! Only four species in the cat family can roar: lions, tigers, leopards, and jaguars. And zoologists are pretty sure those four species can’t purr. But why?
Hosted by: Hank Green
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http://www.sciencedirect.com/science/article/pii/0034568772900643 (1972)
http://www.sciencedirect.com/science/article/pii/0006899387910079 (1987)
http://www.catsg.org/cheetah/05_library/5_3_publications/F/Frazer_Sissom_et_al_1991_How_cats_purr.pdf (1991)
http://www.sciencedirect.com/science/article/pii/014067369291839Z (Lancet)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1256521/pdf/janat00047-0118.pdf (1989)
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2907.2002.00113.x/abstract (2002)
