Frogs have been around since the age of the dinosaurs, having survived four mass extinctions. Due to their remarkable ability to adapt to extreme conditions, they have thrived in almost all landscapes around the world from deserts to tropical rain forests, with some frogs even found in the Arctic circle. However, they are highly sensitive to changes in the environment. The world’s frogs are disappearing fast. Global assessments have showed that amphibians are the world's most threatened group of vertebrates with over one-third of all amphibian species being classified as endangered. Here are some interesting facts about these amazing creatures.