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Why do groundhogs whistle?

Why do Groundhogs whistle? 
                                                                                    
Groundhogs live in widely branched burrows below the ground, but come out on the surface every day to collect grasses, seeds, and insects. A few species live in colonies in high mountains. They divide work amongst them – when a few animals have gone out in search of food, the others are on guard. If they sense danger from approaching enemies, they emit a shrill whistle to warn the others. In the summer, the animals must feed enough to put on a thick layer of fat so that they can survive the 6 – 9 months long winter sleep.




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Why do groundhogs whistle?

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