Tuatara is the closest living relative to the dinosaurs of the past. Dinosaurs died out 65 million years ago, but tuataras didn’t. Scientists think that they survived because of their small size. Tuataras have a third eye on the top of their heads. They don’t actually see with it but use it as a light sensor.
Dinosaurs roared for about 150 million years before they disappeared. We humans have only been around for about 2 million years. But cockroaches are 350 million years old and still going strong! Cockroaches can survive in extreme conditions. They can be frozen, then thawed, and walk away as if nothing had happened. They can go for incredibly long time without eating anything. And that is the secret of their success. When there’s nothing to eat at all, they’ll turn on each other and dine on their friends. They can even recover after being frozen!