The discovery of a well-preserved fossil of Najash rionegrina, an ancient snake from Argentina, has provided significant insights into the evolution of snakes. This fossil, dating back nearly 100 million years, reveals that early snakes possessed hind legs and a cheekbone, features that have nearly disappeared in modern snakes. The findings challenge the long-held belief that snakes originated as small burrowers, suggesting instead that they were larger predators with wide mouths. Researchers utilized micro-computed tomography (micro-CT) scanning to analyze the fossil, allowing them to reconstruct its skull in detail and clarify the anatomical features of snakes. This research not only corrects previous misunderstandings about the jugal bone in snakes but also highlights the evolutionary transition from legged ancestors to the limbless snakes we see today. Despite later discoveries complicating the narrative of snake evolution, Najash remains a crucial specimen for understanding the early stages of snake development, showcasing a species in transition.