Scientists Discover 240-Million-Year-Old Fossil

Scientists just discovered an ancient fossil known as the “mother of all lizards,” or: the oldest ancestor of squamates, a category of reptiles that include snakes, lizards and creepy legless worms called amphisbaenians, which make up the largest group of living land vertebrates on Earth. Despite occupying so much of the Earth, scientists have found gaps in its understanding of squamate lineage.