The Megalodon was the biggest shark ever, but it is extinct. The word Megalodon means giant tooth. The Megalodon is an ancient shark that could have been 40 feet long, and some people say it could have been 50-100 feet long. It is at least two to three times the size of the great white shark. One tooth was the size of a personís hand. It ate mostly whales. It also ate 2% of its body weight a day. Its jaw opened 6 feet wide and 7 feet high. It did not chew. It ate big chunks and swallowed them whole. It lived roughly 1.5 to 25 million years ago. It is now extinct, yet its exact time of extinction is debated.