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The evolution of speech is a complex story, but one key feature is we humans' ability to form intricate sounds using vowels and consonants. Animals have simpler anatomy, so they can't produce as many distinguishable sounds, instead combining their basic noises into more complicated patterns that become things like birdsong.
But it turns out even the monosyllabic noises work like a sort of Morse code, with specific structures that contain different information.
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