Cats purr during both inhalation and exhalation with a consistent pattern and frequency between 25 and 150 Hertz. Various investigators have shown that sound frequencies in this range can improve bone density and promote healing.
10月17日，英国剑桥郡一只猫呼噜声达到54.6 分贝打破吉尼斯世界纪录的视频画面曝光。一名官方评审员和一名声学工程师在现场见证这一过程，记录仪显示贝拉呼噜声高达54.6 分贝，报道称这相当于一个水壶内水烧开的声音。猫主人称贝拉呼噜声一直很大，有时甚至能盖住电视声。
