As a historian (Creation Historian) many people ask me why the dinosaurs only survived for 500 years. The answer is a simple one and an answer that

will make sense. You see, 6000 years ago the Earth was a much different place that it is today, it was covered with jungles and all sorts of poisonous plants. It was at this time that the dinosaurs were created to make the Earth habitable for humans, this included clearing the excess vegetation and making fields so that humans could toil in the fields. Other works carried out by the dinosaurs was to make waterways for human boats such as the English Channel and of course the Panama and Suez canals (did you really think they were just 'there'). After this the dinosaurs were ordered into the crevasses and to become oil and gas. So, you see...the dinosaurs were useful and still are.