Snakes evolved from lizard ancestors
Snakes are a branch of squamate reptiles that evolved from lizard ancestors. Fossils, anatomy and genetic studies continue to refine the story, so the most accurate account focuses on patterns rather than a single dramatic date. Limb reduction, elongation and specialised skull anatomy evolved alongside many different ways of living.
Adaptations differ across lineages
All snakes use chemical cues collected by the tongue and processed by the vomeronasal system, but other traits are not universal. Heat-sensitive pits occur in some lineages, venom systems occur in many but not all snakes, and skull mobility varies with diet and ancestry. Snakes do not “unhinge” their jaws; flexible joints and ligaments allow the skull to accommodate prey.
Diversity is ecological as well as anatomical
Snakes occupy burrows, forests, rivers, grasslands and oceans, with diets ranging from eggs and snails to fish, mammals and other reptiles. Their survival depends on intact habitat, suitable prey and reduced persecution. Evolutionary explanations should distinguish evidence from speculation and avoid treating a single adaptation as the reason for every snake’s success.
