Small and shy or big and fierce? Bright as a jewel or hardly visible? Four legs, two legs, or no legs at all? When talking about lizards and snakes—the squamates—the answer is usually ... Yes! This ancient group, whose scientific name is Latin for “scaled,” is more diverse than mammals and as old as dinosaurs. And they’re almost everywhere: harsh desert to lush rainforest, high in the treetops, and beneath the ground. Whatever the environment, one of the 8,000 squamate species on Earth calls it home.