statues of half man half animal on ancient time,real?

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I have always been fascinated with statues of half human half beast which are all over the globe. We have seen statues that were built hundred,thousands of years ago. Why do the sculptor made all these? Was it just pure imagination or as the experts says, these are the kinds that walked down the Earth years ago. These are the extra terrestrial's children on human. I would like to believe so. Their imagination seem too much that they could create something like the cyclops, the sphynx. etc. Like how to stonehenge cannot be vividly explained.