Whistling pig is not an unusual activity among us. But what makes it interesting is why pigs whistle? This question has been puzzling us for centuries. The answer that scientists have found is pigs whistle because they are happy. Most pigs live in a rectangular steel cage everyday; they don’t have entertainment; what they can do is just to eat. Once they have done the eating, the only thing they can do is to whistle. And whistle can help them to relax and the most important function is to help their digest
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