As I pointed out, many things were not mentioned in the Bible. Why is that so? Well, the Bible brings us a means of Salvation and a rule book for clean living. It was not intended to be a Technical Manual of the Universe.
God gave us things to be discovered and things yet to be invented as a gift. We can pursue learning things on our own. The Nephilim gave us metal weapons of war; and, that is how they angered God. It was God's intention that we discover those crafts on our own, just as there are many other wonders available for our discovery and development. (Book of Enoch)
Now we are poised to learn that we aren't the only living Creation.
Go with the flow.
Here’s a thought you just prompted; if God can come to us for salvation as Christ, what’s to say he didn’t do the same thing for other self-sentient beings he created? Or do they even require it? What if some of those beings didn’t require salvation, never had to leave their Garden of Eden? There is still only one God in this scenario.