Here's an interesting snippet for you....
Cats when wanting food generally 'meow' at a frequency of between 220 and 520 hertz. Human babies cry in the same frequency range (usually between 300 and 600 hertz).
Studies have suggested that cats have developed this urgent 'meow' to within this range as they know that we humans find this frequency range hard to ignore when it comes to dealing with the cries of a baby or a cat.
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