THE 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. 



411 



