Main idea: A student in Colombia has uncovered the shell of an ancient giant turtle.
The 60-million-year-old shell is about the size of a small car, and it was found inside a coal mine.
Columbia is the world's fourth largest exporter of coal.
The student worked for four days to remove the shell from the earth.
This type of giant turtle lived about five million years after the end of the dinosaurs.
Experts believe that more living space, a good food supply, and fewer dinosaurs allowed the turtles to survive and grow to their large size..