Eve was tempted by Satan disguised as a talking snake

The Genesis text calls the character simply "the serpent," more crafty than any other wild animal God had made (Genesis 3:1); it neither names Satan nor describes any act of disguise or possession. The serpent just speaks, the way the text presents it without further comment.

The identification with Satan is a real and very old interpretive move (see the companion entry on the serpent's later iconography) running through Second Temple Jewish literature before becoming explicit in Revelation 12:9. That's an inference the wider biblical canon eventually makes plain, drawing a theological line between an ordinary-seeming creature in Genesis 3 and a cosmic adversary named much later. It's a defensible, ancient reading, but it's doing interpretive work the Genesis narrative itself leaves undone.