A 113-million-year-old fossil from Brazil has been discovered and is the first four-legged snake that scientists have ever seen.
Several other fossil snakes have have been found with hind limbs, but the new find is estimated to be a direct ancestor of modern snakes.Its delicate arms and legs were not used for walking, but probably helped the creature to grab its prey.
The fossil shows adaptations for burrowing, not swimming, strengthening the idea that snakes evolved on land.
