A quarry in south central Colorado is found to hold the remains of four different species of dinosaurs. Two are docile herbivores: Camarasaurus and Stegosaurus. But the other remains are those of predators: Allosaurus and Ceratosaurus. Many of the bones have the telltale signs of bite and claw marks. By comparing the size, depth, and shape of the marks and comparing them to the teeth and claws of the predators, experts are able to identify which of the dinosaurs is responsible for the grisly act of carnage. Then, using the forensic evidence found at the site, and intriguing new results learned through CAT scanning; they are able to reconstruct a battle that took place between the two predators, in a fight for dominance.

Utahraptor, Allosaurus, Majungatholus, Albertosaurus, and Tyrannosaurus were the elite killers of the prehistoric world. Scientists now know more about these predatory dinosaurs by studying their skeletal designs and using information revealed through CAT scanning technology. Listen as the experts size up these predators found in numerous worldwide locations and various time periods in their search for the largest killer of all.

Discover a prehistoric watering hole where multiple dinosaur species fought to the death under the intense heat of a Jurassic drought. Watch as more than 15,000 bones are uncovered at the scene of one of the bloodiest battles in Paleohistory. Scientists are able to identify Allosaurus and its rival Ceratosaurus as the predators. Evidence collected at the site, detailed animal behaviors, and the results of hi-tech CAT scanning are used to recreate what happened on this dry lakebed in Utah 150 million years ago.

In 1998, a team of paleontologists working on the island of Madagascar uncover the remains of Majungatholus--one of the most terrifying predators of its age. However, several bones are found to hold bite marks from another predator. Modern crime scene investigative methods are used to measure the bite marks, and together with evidence found at another site, the attacker is identified as another Majungatholus; thus uncovering the first authentic case of dinosaur cannibalism. Experts recreate a scenario of what occurred when a male Majungatholus went in search of a mate, but found a non-receptive female who was more interested in protecting her young than mating.

In south central Montana, a group of bird-like predators called Deinonychus are unearthed, altering our view of dinosaurs forever. Scientists are quick to recognize that these creatures, equipped with a deeply recurved sickle-shaped claw, do not fit into the image of a slow-moving, cold-blooded dinosaur. Lying next to the skeletons of these raptors were the remains of a large plant-eating dinosaur called Tenontosaurus. Modern CAT Scanners help scientists get a never-before-seen look into how these animals moved, fought, and behaved. Watch as experts recreate what happened when a pack of deadly raptors took on an adversary more than twice their own size.

A routine expedition on a hillside in the badlands of South Dakota leads a paleontologist to an amazing discovery. The mummified tail of Edmontosaurus, a duckbilled dinosaur, is uncovered with evidence of a vicious attack--tiny serrated teeth are found and linked to Dromaeosaurus; members of the raptor family. However, the bones also reveal evidence of a second attacker--Tyrannosaurus Rex. Watch as experts recreate the events leading up to the slaughter of Edmontosaurus, revealing a predatory world far more calculated--and complex--than we originally thought.

The scene of the worst mass slaughter in the prehistoric world was discovered by paleontologists in Canada in 1986. Evidence shows that an entire herd of plant eating Pachyrhinosaurus was massacred by a giant meat-eater, Albertosaurus, who left hundreds of bones piled one atop the other. Forensic investigation showed that the bodies were crushed and broken by this powerful, agile, and terrifying hunter. Watch as experts recreate events that may have lead up to the carnage of these ancient beasts, revealing a predatory world far more calculated--and complex--than we originally thought.

Tyrannosaurus rex was the most feared predator on earth--but to one dinosaur, he was prey. A discovery in Montana reveals the broken and fractured bones of a juvenile T-rex, and the teeth of its attacker--Nanotyrannus. As modern crime scene investigative methods are used, paleontologists get an unprecedented look into a 65-million-year-old battle. Modern CAT scanning gives science a never-before-seen look into the functions of the brains of Tyrannosaurus and Nanotyrannus. Watch as experts recreate what happened when Nanotyrannus came upon an unguarded juvenile Tyrannosaurus rex.

A quarry in south central Colorado is found to hold the remains of four different species of dinosaurs. Two are docile herbivores: Camarasaurus and Stegosaurus. But the other remains are those of predators: Allosaurus and Ceratosaurus. Many of the bones have the telltale signs of bite and claw marks. By comparing the size, depth, and shape of the marks and comparing them to the teeth and claws of the predators, experts are able to identify which of the dinosaurs is responsible for the grisly act of carnage. Then, using the forensic evidence found at the site, and intriguing new results learned through CAT scanning; they are able to reconstruct a battle that took place between the two predators, in a fight for dominance.

Utahraptor, Allosaurus, Majungatholus, Albertosaurus, and Tyrannosaurus were the elite killers of the prehistoric world. Scientists now know more about these predatory dinosaurs by studying their skeletal designs and using information revealed through CAT scanning technology. Listen as the experts size up these predators found in numerous worldwide locations and various time periods in their search for the largest killer of all.

Discover a prehistoric watering hole where multiple dinosaur species fought to the death under the intense heat of a Jurassic drought. Watch as more than 15,000 bones are uncovered at the scene of one of the bloodiest battles in Paleohistory. Scientists are able to identify Allosaurus and its rival Ceratosaurus as the predators. Evidence collected at the site, detailed animal behaviors, and the results of hi-tech CAT scanning are used to recreate what happened on this dry lakebed in Utah 150 million years ago.

In 1998, a team of paleontologists working on the island of Madagascar uncover the remains of Majungatholus--one of the most terrifying predators of its age. However, several bones are found to hold bite marks from another predator. Modern crime scene investigative methods are used to measure the bite marks, and together with evidence found at another site, the attacker is identified as another Majungatholus; thus uncovering the first authentic case of dinosaur cannibalism. Experts recreate a scenario of what occurred when a male Majungatholus went in search of a mate, but found a non-receptive female who was more interested in protecting her young than mating.

In south central Montana, a group of bird-like predators called Deinonychus are unearthed, altering our view of dinosaurs forever. Scientists are quick to recognize that these creatures, equipped with a deeply recurved sickle-shaped claw, do not fit into the image of a slow-moving, cold-blooded dinosaur. Lying next to the skeletons of these raptors were the remains of a large plant-eating dinosaur called Tenontosaurus. Modern CAT Scanners help scientists get a never-before-seen look into how these animals moved, fought, and behaved. Watch as experts recreate what happened when a pack of deadly raptors took on an adversary more than twice their own size.

A routine expedition on a hillside in the badlands of South Dakota leads a paleontologist to an amazing discovery. The mummified tail of Edmontosaurus, a duckbilled dinosaur, is uncovered with evidence of a vicious attack--tiny serrated teeth are found and linked to Dromaeosaurus; members of the raptor family. However, the bones also reveal evidence of a second attacker--Tyrannosaurus Rex. Watch as experts recreate the events leading up to the slaughter of Edmontosaurus, revealing a predatory world far more calculated--and complex--than we originally thought.

The scene of the worst mass slaughter in the prehistoric world was discovered by paleontologists in Canada in 1986. Evidence shows that an entire herd of plant eating Pachyrhinosaurus was massacred by a giant meat-eater, Albertosaurus, who left hundreds of bones piled one atop the other. Forensic investigation showed that the bodies were crushed and broken by this powerful, agile, and terrifying hunter. Watch as experts recreate events that may have lead up to the carnage of these ancient beasts, revealing a predatory world far more calculated--and complex--than we originally thought.

Tyrannosaurus rex was the most feared predator on earth--but to one dinosaur, he was prey. A discovery in Montana reveals the broken and fractured bones of a juvenile T-rex, and the teeth of its attacker--Nanotyrannus. As modern crime scene investigative methods are used, paleontologists get an unprecedented look into a 65-million-year-old battle. Modern CAT scanning gives science a never-before-seen look into the functions of the brains of Tyrannosaurus and Nanotyrannus. Watch as experts recreate what happened when Nanotyrannus came upon an unguarded juvenile Tyrannosaurus rex.

A quarry in south central Colorado is found to hold the remains of four different species of dinosaurs. Two are docile herbivores: Camarasaurus and Stegosaurus. But the other remains are those of predators: Allosaurus and Ceratosaurus. Many of the bones have the telltale signs of bite and claw marks. By comparing the size, depth, and shape of the marks and comparing them to the teeth and claws of the predators, experts are able to identify which of the dinosaurs is responsible for the grisly act of carnage. Then, using the forensic evidence found at the site, and intriguing new results learned through CAT scanning; they are able to reconstruct a battle that took place between the two predators, in a fight for dominance.

Utahraptor, Allosaurus, Majungatholus, Albertosaurus, and Tyrannosaurus were the elite killers of the prehistoric world. Scientists now know more about these predatory dinosaurs by studying their skeletal designs and using information revealed through CAT scanning technology. Listen as the experts size up these predators found in numerous worldwide locations and various time periods in their search for the largest killer of all.

Discover a prehistoric watering hole where multiple dinosaur species fought to the death under the intense heat of a Jurassic drought. Watch as more than 15,000 bones are uncovered at the scene of one of the bloodiest battles in Paleohistory. Scientists are able to identify Allosaurus and its rival Ceratosaurus as the predators. Evidence collected at the site, detailed animal behaviors, and the results of hi-tech CAT scanning are used to recreate what happened on this dry lakebed in Utah 150 million years ago.

In 1998, a team of paleontologists working on the island of Madagascar uncover the remains of Majungatholus--one of the most terrifying predators of its age. However, several bones are found to hold bite marks from another predator. Modern crime scene investigative methods are used to measure the bite marks, and together with evidence found at another site, the attacker is identified as another Majungatholus; thus uncovering the first authentic case of dinosaur cannibalism. Experts recreate a scenario of what occurred when a male Majungatholus went in search of a mate, but found a non-receptive female who was more interested in protecting her young than mating.

In south central Montana, a group of bird-like predators called Deinonychus are unearthed, altering our view of dinosaurs forever. Scientists are quick to recognize that these creatures, equipped with a deeply recurved sickle-shaped claw, do not fit into the image of a slow-moving, cold-blooded dinosaur. Lying next to the skeletons of these raptors were the remains of a large plant-eating dinosaur called Tenontosaurus. Modern CAT Scanners help scientists get a never-before-seen look into how these animals moved, fought, and behaved. Watch as experts recreate what happened when a pack of deadly raptors took on an adversary more than twice their own size.

A routine expedition on a hillside in the badlands of South Dakota leads a paleontologist to an amazing discovery. The mummified tail of Edmontosaurus, a duckbilled dinosaur, is uncovered with evidence of a vicious attack--tiny serrated teeth are found and linked to Dromaeosaurus; members of the raptor family. However, the bones also reveal evidence of a second attacker--Tyrannosaurus Rex. Watch as experts recreate the events leading up to the slaughter of Edmontosaurus, revealing a predatory world far more calculated--and complex--than we originally thought.

The scene of the worst mass slaughter in the prehistoric world was discovered by paleontologists in Canada in 1986. Evidence shows that an entire herd of plant eating Pachyrhinosaurus was massacred by a giant meat-eater, Albertosaurus, who left hundreds of bones piled one atop the other. Forensic investigation showed that the bodies were crushed and broken by this powerful, agile, and terrifying hunter. Watch as experts recreate events that may have lead up to the carnage of these ancient beasts, revealing a predatory world far more calculated--and complex--than we originally thought.

Tyrannosaurus rex was the most feared predator on earth--but to one dinosaur, he was prey. A discovery in Montana reveals the broken and fractured bones of a juvenile T-rex, and the teeth of its attacker--Nanotyrannus. As modern crime scene investigative methods are used, paleontologists get an unprecedented look into a 65-million-year-old battle. Modern CAT scanning gives science a never-before-seen look into the functions of the brains of Tyrannosaurus and Nanotyrannus. Watch as experts recreate what happened when Nanotyrannus came upon an unguarded juvenile Tyrannosaurus rex.