“ In habits the dinosaurs were terrestrial, and often amphibious, and the structure of the tail in some genera indicates its use as a swimming organ. Some were of graceful, bird-like action, walking, running, or leaping on their three-toed hind limbs. Others were heavy, clumsy beasts, walking or crawling on their solidly built four legs. Dinosaurs vary greatly in size. The smallest are of the size of a chicken. The largest are the greatest land animals ever known to have existed, with lengths of 60 to 70 feet, heights of 10 to 20 feet, and weights estimated to have varied from 20 to 25 tons. ”

“ Fossil remains of dinnsaurs are to be seen only in the larger museums of the country. The American Museum of Natural History in Central Park, New York City, has the finest series of skeletons, many of which are accompanied by water-color restorations of these animals. Other museums where dinosaurs may be seen are the United States National Museum at Washington, Peabody Museum of Yale University, Carnegie Museum at Pittsburg, where a complete skeleton of Diplodocus is mounted, the Field Columbian Museum at Chicago, and the museum of the University of Wyoming at Laramie. ”

“ The dentition of dinosaurs is fitted for both carnivorous and herbivorous food. Beak-like structure of the jaws is common. The teeth are often implanted in sockets and in some genera they appear in successional series. The head of dinosaurs is usually disproportionately small, and the brain is always of very small size and low degree of convolution, indicating an inferior grade of intelligence in these animals. ”