Aaron's rod became a big snake (Exodus 7:8-10).
When something not alive, like dust, becomes alive, like a living person (Genesis 7:2): is this not called "creation"?
So, when Pharaoh's wise men, sorcerers, and magic-practicing priests of Egypt also did the same (Exodus 7:11, 12): how could we called this instead?
I read about some JWs explaining it as a magic illusion. But I suppose this answer would not solve the problem: since Aaron's performance was called a miracle (Exodus 7:9), how could we be sure that all the other miracles were not illusions as well then?
Unless demons materialized themselves into snakes...