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Many of the trees were cut down in the area where the giraffes roamed creating a very limited food source with only small hard to reach plants and shrubs.
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A mutation occurs with the giraffes that gave birth to to a short necked giraffe.
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Due to natural selection, the short necked giraffe survived and reproduced more short necked offspring. Over a long period of time the short necked giraffe gave birth to the Tommy.