Tuataras are ancient nocturnal reptiles that were more popular in prehistoric times. They are found in the offshore islands of New Zealand where they live in burrows that they construct themselves or that they steal from petrels. Once in awhile, they will eat petrel chicks. But their main diet consists of large insects. Tuataras mature very slowly. They are grown up when they are 10-20 years old but can live to be 100.