Unto the woman he said, I will greatly multiply thy sorrow and thy conception; in sorrow thou shalt bring forth children; and thy desire shall be to thy husband, and he shall rule over thee. Genesis 3:16
Trivia: In Genesis 4, why did Cain became so angry that he killed his brother Abel?
What the Bible says about Cryptozoology
Not much is known about this creature, except that he could talk and was the most clever ("subtil" in the KJV) of all of God creatures.
Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman.... Genesis 3:1
And he could walk as originally created, because later he was forced by God to crawl on his belly and eat dust as a punishment. The Bible doesn't say what he ate before God punished him.
And the LORD God said unto the serpent, Because thou hast done this, thou art cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go, and dust shalt thou eat all the days of thy life. Genesis 3:14