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purr
A purr is a tonal fluttering sound made by some species of felids, and two species of genets. It varies in loudness and tone among species; and in the same animal.
The term ''purring'' has been used without precise definition in much scientific literature on the subject. It has been claimed without proper documentation that purring animals include viverrids (civet), mongoose, bears, badgers, and hyaenas, rabbits, squirrels, guinea pigs, tapirs, ring-tailed lemurs, elephants,〔http://www.elephants.com/media/philadelphia_enquirer_5_4_05.htm〕 raccoons and gorillas.
==Mechanism==
The mechanism by which cats purr is speculative. There is a unique "neural oscillator" in the cat’s brain of uncertain significance.〔(【引用サイトリンク】 Why and how do cats purr? )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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