Cats know exactly how to get what they want from their owners. According to a 2009 study, they do it by mimicking babies crying. Cats in want of food will make an urgent cry or meowing sound in the 220 to 520-hertz frequency range while purring at a lower frequency. Babies also cry in this frequency range (usually between 300 and 600 hertz), and humans find it difficult to ignore. Source: Mental Floss
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