Since there isn't any text that clearly points to the spirit of Satan possessing the serpent so that he would lie to Adam and Eve and cause them to eat from the forbidden fruit, is it a possibility that the serpent could have acted on his own to deceive them? This is because the second account of the Genesis stories of creation give the serpent a unique attribute.
Now the serpent was more cunning than any beast of the field which the LORD God had made.
It is already clear from the verse above that the snake was created stubborn by God for this very moment. Mainstream Christians assume that it was the spirit of fallen cherub Lucifer that possessed the serpent and caused the deception, but since there isn't any text in the Bible that clearly points this out, how do we know that the serpent did not act on his own to deceive them? Unless Lucifer was an appointed Cherub in the garden of Eden prior to his fall and then he would launch his attack on the creation by possessing the serpent, but it's a fact that spirits cannot possess animals. The Balaam story is that God made the donkey speak and not possess it to cause it to speak. Unless the devil had the ability to cause the serpent to speak, but where does he get the power to do that when no one had sinned in God's creation to give him that authority?