A new study adds to growing evidence that dinosaurs may have developed from very small animals. Scientists have studied the fossil of a small animal, called Kongonaphon kely, which is believed to be an ancestor of the dinosaurs. The name given the reptile means tiny bug slayer, or very small killer of insects. The four-legged animal is believed to have been just 10 centimeters tall and about 40 centimeters long. Researchers say it lived about 237 million years ago in what is now Madagascar.