a lot of animal sounds are examples of onomatopoiea.
oink, quack, cluck.
Cock-a-doodle-doo in English
I read somewhere just recently that the reason for this is largely because children (infants) first learn to speak through imitating animal sounds. This is evident in nursery rhymes, such as 'Baa Baa Black Sheep'.
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"You know that place between sleep and awake, where you can still remember dreaming? That's where you'll find me..."