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It is a very strange and interesting fact that pigs cannot look straight up in the sky. It is being believed that due to their physical anatomy it is being quite hard for them to look up in the sky their neck muscles and their spines actually limit’s their movement of their head restricts them to totally look upwards.
One of the most interesting fact is that even to look over the tree top they need to take two steps backwards. The physical anatomy or their spine movement is so weak that they cannot afford to make a free movement to look up on the sky and can stare further.
This physical movement is not very common to various animal so it is one of the most odd in its kind in animal anatomy