It is physically impossible for pigs to look up into the sky
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Most animals are designed with their bodies to be able to get to their food sources and to escape from danger. So, for giraffes, they have a neck pointed to the tops of the trees. For pigs, their heads are directed downwards. They can only move the head up enough to be level with their backs. This doesn't allow for any 'star gazing' but does allow them to do everything else the pig needs to do in it's life.
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