A couple of ground rules to follow in this discussion.
First, There is no doubt that Satan is a spiritual entity. Therefore, we know the “serpent” was a spirit.
And second, God is a spirit, and we know He created a vast universe of spiritual beings. I have no reason to doubt there could be as many different species or types of spiritual beings like there are different species on Earth. Perhaps even more.
In Genesis 3, the serpent was numbered among the cattle. "Cattle" as we know it are bovine animals that do little more than eat, poop and destroy the ozone by their production of... Ahem, a natural and potential renewable energy source.:o But cattle could have another meaning as an adjective, as opposed to a noun. The word "cattle" is not limited to a cow. It can be used to describe a class of entities, based on their behavior.
The word “cattle” is related to the word “herd”. A herd refers to large numbers of beasts that hang out in large groups, scattered all over the face of creation.
Based only on what Genesis 3 says, the serpent was the most subtle of all the beasts of the field. The words “beasts” and “field” can also be applied in the spiritual sense as well. Beasts could refer to animalistic or wild creatures (demons). The serpent wasn’t necessarily the strongest, but he was the smartest and the most cunning. When you look at gangs or organized crime, the leaders aren’t usually the strongest physically. They’re the smartest and most ambitious of the group, and they know how to manipulate people.
Genesis 3 is the part where God curses/anoints the serpent an insatiable appetite to consume the carnality and flesh of mankind. Our bodies were formed out of the dust, and so it is the devil's desire to ensure it returns to the dust (death). Our bodies are carnal, and so the more we yield to the desires of the flesh, the more we give in to the works of Satan and make us vulnerable to him. In the garden, Adam and Eve had no fear of the serpent prior to Genesis 4.
Jesus said in John 14:30- “... for the prince of this world cometh, and hath nothing in me.” Why? Because Jesus didn’t walk after the flesh. He followed after the Spirit. Satan didn’t have any rights to attack or harm Jesus. And if we follow after the Spirit, we won’t sin either, and Satan would have no power over us as well.
Romans 8:[1] There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit...[4] That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit."
The curse of God fell on the whole Earth and all of its inhabitants, including the animals. So God didn’t just curse physical snakes. He cursed the entire animal kingdom and the ground we walk on. The “creature”, referred to in Romans 8 (below), refers to God’s physical creation. That all of creation is awaiting the redemption of our bodies and the restoration of the kingdom of God on Earth (as it is in heaven). Remember the Lord’s prayer?
Romans 8:[19] For the earnest expectation of the creature waiteth for the manifestation of the sons of God.[20] For the creature was made subject to vanity, not willingly, but by reason of him who hath subjected the same in hope,[21] Because the creature itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God.[22] For we know that the whole creation groaneth and travaileth in pain together until now.
There’s an end to all of this, and it will happen following the 2nd coming of Christ as stated in the Book of Revelations, and it involves God having fully mature sons of God, redeemed from the Earth (Revelations 14).
Regarding Hell- yes it was originally intended for Satan and his minions. But eventually, they and Hell will be cast in the Lake of Fire, along with all of its inhabitants. (Revelations 20:10).
Long answer, but you asked an interesting question.