National Geographic : 1919 May
TIE BIG GAME HUNTERS' MOVING CAMP The big flat-boat drifts downstream with the current. It is steered from the stern, and by concerted action of both oars can be pushed broadside to avoid rocks. The mosquitoes are often so thick that no one can work without a net over the face and gloves on the hands. lated to any living reptile, yet they had some characters common to the lizards, crocodiles, and birds. Of the kinds characteristic of the pe riod one species, an herb-eater named Trachodon, was more than 30 feet long and about 15 feet high when standing erect (see page 408). Its head, with broadly expanded mouth, resembles that of a duck, but back of the beak there are more than two thousand small teeth, dis posed in many vertical rows, each con taining several individual teeth, the new ones coming up from below as the old ones wore out. The long hind legs terminated in three large hoofed toes, and the shorter, slen der front feet were partly webbed. A long, thin, slender tail acted as a power ful swimming organ, and the body was covered with rough tuberculate skin. Having no means of defense, it lived chiefly in the water, where it was free from attacks of the flesh-eaters. With the "duck-billed" Trachodon there were other large closely related forms inhabiting the water. Saurolo phus was similar in build, but character ized by a large crest extending above the skull, and pelvic bones that were devel oped for attachment of powerful tail muscles. It was probably a distinctly aquatic type (see page 418). A DINOSAUR WITH PNEUMATIC BONES Along the shores lived Ornithomimus, bird mimic, as the name implies, one of the most remarkable of the dinosaurs. A skeleton found last year shows it to have been a toothless creature, the jaws sheathed like the beak of a bird. The bones were light and pneumatic, like those of birds, but the skeleton closely resembles that of the flesh-eating dinosaurs. It was about 12 feet in length, with long, slender hind legs and shorter front legs. This was an agile creature, different from the typical flesh-eaters in feeding habits and doubtless a shore-liv ing type that may have fed on crusta ceans.