Video from Dr. Michael Heiser
"Do you believe that John was correct or mistaken in Rev 12:9? «the great dragon was thrown down, that ancient serpent, who is called the devil and Satan.» If you think John is correct, then you must conclude that the serpent in the garden was more than an animal. It's not just a snake." from video introduction.
Serpents in the Garden
"..With this in mind, maybe it could change our view on the serpent in the Garden of Eden. Could it be that it wasn’t an actual snake speaking to Eve, but rather a seraphim-angel of some type? It would explain why no one was concerned about a talking animal when none of the others appear to be talkative! It could also help to explain the punishment God gives the serpent: to crawl on its belly and eat dust. Snakes already do that, so why would that be something unusual and a punishment for it? This “eating/licking the dust” that snakes now do is referenced again in Isaiah 65:25 and Micah 7:17 as part of their natural state it seems..." from the article: What are the Seraphim, and was the devil one of them?