Largest Shark in History
Megalodon was an ancient shark that may have been 40 feet long or even more. This is at least two or three times as long as the Great White Shark, but this is only an estimate made from many fossilized teeth and a few fossilized vertebrae that have been found. These giant teeth are the size of a person's hand! No other parts of this ancient shark have been found, so we can only guess what it looked like. Since Megalodon's teeth are very similar to the teeth of the Great White Shark, it is thought that Megalodon may have looked like a huge, streamlined version of the Great White Shark. Megalodon lived from roughly 25 to 1.6 million years ago, during the Miocene and Pliocene epochs. It is now extinct, but the exact time of its extinction is hotly debated.
Megalodon's diet probably consisted mostly of whales. Sharks eat about 2 percent of their body weight each day; this a bit less than a human being eats. Since most sharks are cold-blooded, they don't have to eat as much as we eat.
Teeth and Jaw
Shark fossils are extremely rare because sharks have no bones, only cartilage, which does not fossilize well. Their teeth, however, are very hard. Their teeth are made of a bone-like material coated with hard enamel and they fossilize very well. Megalodon teeth are similar to those of the Great White Shark, but are much bigger, thicker, and with finer serrrations. Megalodon's jaws could open 6 feet wide and 7 feet high. The jaws were loosely attached by ligaments and muscles to the skull, opening extremely wide in order to swallow enormous objects. It could easily swallow a large Great White Shark whole. Like most sharks, Megalodon's teeth were probably located in rows which rotated into use as they were needed. Most sharks have about 3-5 rows of teeth at any time. The front set does most of the work. The first two rows are used for obtaining prey, the other rows rotate into place as they are needed. As teeth are lost, broken, or worn down, they are replaced by new teeth. Megalodon may have had hundreds of teeth at one time. It did not chew their food like we do, but gulped it down whole in very large chunks.