FOURTH FLOOR, SOUTHEAST WING 



A curious and remarkable instance of parallel evolution is furnished by 

 Giraffe Camel tne cases °f the giraffe camel and the giraffe. The former 

 and Giraffe was descended from the primitive camel which lived in North 

 America, while the giraffe had for its ancestor the primitive 

 antelope of the Old World; thus each species evolved inde- 

 pendently of the other. The giant pigs, or elotheres and the 

 pygmy hippopotamus will repay examination. 

 The primitive rhinoceros-like animals are shown near the center of the 

 hall on the right. It seems hard to believe that our vast western country 

 and indeed all North America, was once the home of the 

 rhinoceros. As here indicated vast herds roamed over the 

 fields in the Tertiary Period and their fossil remains are found imbedded in 

 the Plains of South Dakota. Opposite these are shown the ancestors of 

 the dogs, cats and other carnivores, among which is the giant saber-toothed 

 tiger. 



On the south side on the right are skeletons of titanotheres, on the left 

 of uintatheres, huge extinct, horned animals peculiar to North America. 



Giant Pigs 

 and Pygmy 

 Hippopot- 

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Rhinoceros 

















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Restoration of Brontosaurus. One of the largest of the amphibious dinosaurs, cold- 

 blooded, slow-moving, unintelligent creatures that grew to large size (65 ft. in length) in 

 the rich vegetation of the Reptilian era 



