“You can see the fight even more impressively in the Cretaceous Period, some millions of years later than the Bone Cabin dinosaurs. By that time the huge but clumsy and helpless amphibious dinosaurs had become extinct. The unarmored Camptosaurus, Iguanodonts and their relatives had taken to the water as swimmers rather than waders, and had become the Duck-billed dinosaurs, with rows of small teeth behind a duck-like bill, web feet and a powerful swimming tail. [Illustration: _Courtesy of American Museum of Natural History._ TRACHODON, A DUCK-BILLED DINOSAUR. Reptile, sixteen feet high, alarmed by the approach of a huge carnivorous Tyrannosaurus, ready to plunge into the water for safety.] “The armored dinosaurs had developed stronger armor, while another group had devised a novel and most extraordinary protection, a huge buckler over the head and tremendous horns over the eyes and on top of the nose. There were the Horned Dinosaurs, with their huge heads. One of these, Triceratops, he of the three-horned face, had a neck with an enormous bony frill like the spiked collar that some bulldogs wear, as well as his threatening horns. He was a powerful beast, Perry, this Triceratops, and must have been able to hold his own against the terrible carnivorous dinosaurs that threatened every moment of their lives.” “Were they as big?” “Yes, bigger and far more menacing. Tyrannosaurus, the Tyrant Saurian, was perhaps the fiercest creature that ever drew breath upon the earth. He reached a length of forty-seven feet and stood twenty feet high, standing upon his huge hind legs. His head was more than four feet long and his deep jaws bore a grim array of tearing six-inch teeth. The hind legs, though larger than those of elephants, had feet like those of birds, with sharp ripping claws, and the forefeet were clawed like the talons of an eagle.” “Not much chance if a thing like that got after you,” the boy ejaculated. “It would be a mistake, though, Perry,” his uncle warned him, “to imagine even the Tyrannosaurus as swift or active. An animal larger than an elephant, with a tiny reptile brain, smaller than a man’s clenched fist, could never have leapt or sprung upon a foe, but must have advanced with a heavy lumbering run. There came the value, my boy, of the great massive defense of Triceratops, the three-horned, for while that heavy head with the neck collar of plates would have been of little value against a small, swift enemy, it might easily impale the ponderous Tyrannosaurus as he ran fiercely though clumsily onward to the fight. They were slow and deadly fighters, Perry, those giant reptiles of old, and probably, every meeting meant the death of one or both, and was ended with the first or second grapple.” “I wish we could see one of those fights between two scrappy monster Saurians, anyway,” the boy said wistfully.