There is not sufficient proof as to why dinosaurs went extinct, but experts believe it is related to geological events, diseases, climate change and lack of plant life for sustenance. The last known dinosaurs, according to their fossils, existed about 65 million years ago.
Over the years, there have been many theories and speculations about why dinosaurs went extinct. As more fossils are attained and technology allows science to advance further, palaeontologists have new theories. A persistent theory is that the sunlight was blocked by a large meteorite that crashed into the Earth. Without the sun, plants were unable to grow, and plant-eating dinosaurs would have died without a proper food source. Without herbivore dinosaurs, the carnivore dinosaurs also lose their food source.