Megalodon were the largest sharks to have ever lived and are well known for their gigantic blade-like teeth which could reach up to 7 inches long and scientists have described as ‘Ultimate cutting tools’. Early Megalodon sported three-pronged teeth which acted like a fork to grasp and tear apart fast-moving fish but by the later Megalodon shark species they had developed flattened teeth with serrated edges for killing and eating fleshy animals like whales and dolphins. The development in the teeth of the early megalodon to the late is estimated to have taken 12 million years.