Prehistoric Predators: Monster Shark

Large fossil teeth and computer animations of the giant shark Megalodon attacking whales along with filmed scenes of great white sharks swimming, violently thrashing their heads sideways while biting down on baits, and jumping out of the water in capturing prey are the main features in  Prehistoric Predators: Monster Shark . Megalodon's skeleton was made of cartilage, which quickly decays from salt water, sand, and bacteria so that only the teeth and the vertebrae remain long after death. The constant and lifelong tooth replacement quality of sharks means that in twenty-five years, a shark has shed 20,000 teeth. The 1909 Bashford Dean jaws reconstruction of Megalodon is viewed as inaccurate with more teeth used than is found in the jaws of the great white shark; the more accurate current reconstruction has twenty-four teeth in the upper jaw and twenty-two teeth in the lower jaw with 200 replacement teeth lining the jaws, which are seven and a half feet in height and eight and a half feet in width. The counting of vertebral rings by Bruce MacFadden indicates that Megalodon lived between twenty-five and forty years or more. Megalodon is estimated to have been 50-60 feet and 50 tons. Using computer reconstructions, Stephen Wroe calculates the bite force for the largest great white sharks to be 4,000 pounds and for Megalodon at 52-67 feet to have been 24,395-40,960 pounds. There are filmed scenes of various marine mammals, and the fossil jaws of prehistoric dolphins and a Squalodon are featured. Ocean cooling at 6-1.8 million years ago, the loss of most of the whales, and the polar migrations of the large whales are viewed as the probable reasons for Megalodon's extinction.Megalodon and the prehistoric sperm whale are featured in excellent realistic computer animations in "Deep Sea Killers" on disc 2 of  Jurassic Fight Club: Season One .

Grandson loved his Christmas Present.

This is the first show that I have found to be truly great about the Meg. Again, the National Geographic group got it right. I saw a show 15yrs ago on Shark Week that was about the Meg, but I have not been able to find it and this was just perfect. I have a child who loves sharks and this made her ask questions and look for answers that the researchers on this show believe are fact. Thank you for this great show, I wish there were more of them available.

This is, without a doubt, one of the best documentaries on the Tyrannosaurus rex of the prehistoric shark world! The research in is great, and Megalodon is portrayed the way it should be: A badass predator!

Iam always been a fan of sharks, I have several books about them, including technical and popular magazines, but I was expecting a little more about this especial DVD. A little expensive for a program TV

Great movie! My son watches it quite a bit

No issues.

bought this for my 10 year old with the megalodon tooth replica. He loves this film!

I bought this for my son who is 7 and fascinated by Megalodon. He was fixed to the screen. All of the National Geographic shark DVDs are excellent and this is no exception.

Great viewing into the history of such a large predator. Highly recommend and great viewing.

Our 8 year old likes all things shark and dinosaur and enjoys this DVD

An excellent documentary , if you are fascinated with history's largest shark , Megalodon !