For over a century, the question of how limbed lizards became limbless serpents has haunted paleontology with more theory than evidence. Now, an 80-million-year-old fossil from Brazil — Tametara mirim, one of fewer than ten early snake skeletons known from the age of dinosaurs — offers the clearest anatomical argument yet that underground life drove the transformation. Yet in the same breath, a companion analysis of another ancient snake reveals that divergence began almost immediately, suggesting that the story of snake origins is not a single thread but a branching web of adaptations to radi