Why snakes lost their legs millions of years ago: The true story behind snake evolution

Ancient snakes once possessed four limbs, but evolution dramatically reshaped them. A genetic ‘switch’ called the ZRS enhancer, crucial for limb development, became inactive over millions of years. Fossil evidence reveals a gradual loss, with early snakes retaining tiny hind limbs. This adaptation allowed for efficient movement in new environments, showcasing nature’s remarkable ability to refine form and function.