onomatopoeia
In rhetoric, linguistics and poetry, onomatopoeia is a figure of speech that employs a word, or occasionally, a grouping of words, that imitates the sound it is describing, and thus suggests its source object, such as “bang” or “click”, or animal such as “moo”, “oink”, “quack”, or “meow”.
list of animal sounds
http://www.answers.com/list%20of%20animal%20sounds%20http://www.answers.com/Onomatopoeia
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