: Fossil discoveries like Najash and Pakyrakus showcase early snakes with functional or semi-functional hind limbs, suggesting they may have evolved from either burrowing or aquatic lizards.

: Following the mass extinction of dinosaurs 66 million years ago, snakes underwent an "evolutionary explosion" known as adaptive radiation. They rapidly adapted to diverse environments, including oceans, treetops, and underground burrows. Making Hiss-tory: How Snakes Scaled Evolutionary Heights

: Primitive modern snakes, such as pythons and boas , still possess tiny hind-leg bones (spurs) buried within their muscles.