Someone saw it and wrote about it, most likely in a vision, so, we've got dream symbolism going on here. In Bible prophetic symbolism, there is precedent for humans to be represented as animals and spirits/angels to be represented as humans. (This is likely to reflect the nature of spirits/angels as being more rational while humans are more carnal) So Genesis is a likely the story of a spirit/angel who becomes "clothed in animal skins" - or is forced to incarnate on Earth due to sin.
So close. But you can't quite see the forest for the trees.... Or maybe you can't see the trees because of the forest?
A man was once lost in a forest like this- Wandering around aimlessly... hopelessly... And the forest was so dense. The canopy above so thick that no light could penetrate. So the man walked in darkness and the longer he walked, the more confused he became. Every tree looked the same and though he was certain, and though he was careful-- in time he realized that he had passed this place before. He was going in circles. He was indeed lost.
For forty years he wandered. In the forest. In the desert. In the wilderness. In the sea. Lost. Going in circles. Passing the same places, learning the same lessons again and again, but never remembering in time to avoid the same mistakes. Only after the fact, could he realize the missteps he had taken and then repeated, over and over and over.
So Genesis is likely the story of.... ?
Of? Of two Adam's. Scripture makes this clear. The first-- flesh. The second, spirit. But the flesh came first.
Let me throw you a bone. What day was Adam created? Day 6? --that's what Genesis 1 tells us. But Genesis 2 tells a different story. It tells of another Adam made before the day of man. The Adam before Adam. The Adam before any plant or tree or beast.
Now no shrub of the field had yet grown on the earth, and no plant of the field had yet sprouted, for the LORD God had not caused it to rain on the earth, and there was no man to cultivate the ground. Springs would well up from the earth and water the whole surface of the ground. The LORD God formed the man from the soil of the ground and breathed into his nostrils the breath of life, and the man became a living being.
Understanding now the importance of dream symbolism and scripture's treatment of those things seen in spirit--
The LORD God said, “It is not good for the man to be alone. I will make a companion for him who corresponds to him.” The LORD God formed out of the ground every living animal of the field and every bird of the air. He brought them to the man to see what he would name them, and whatever the man called each living creature, that was its name. So the man named all the animals, the birds of the air, and the living creatures of the field, but for Adam no companion who corresponded to him was found.