INTRODUCTION 21 



?Apache Grizzly (Ursus apache) 



Henshaw's Grizzly (Ursus henshawi), 1920's 



Eastern Cougar (Felis concolor couguar] 



Arizona Wapiti (Cervus canadensis merriami), 1906 



Badlands Bighorn (Ovis canadensis auduboni), 1900's? 



WEST INDIES 



Cuban Solenodon (Solenodon cubanus), about 1910 

 Martinique Musk-rat (Megalomys desmarestii), 1902 



GALAPAGOS ISLANDS 

 James Island Rice Rat (Nesoryzomys swarthi) 



This record shows a steadily accelerated rate of extinction in 

 each of the last three half-century periods. About 38 percent of 

 the losses have been sustained since 1900. This indicates how diffi- 

 cult is the task of preserving native faunas in the present era of 

 intensive modern invention and industrial expansion. 



THE RECORD OF EXTINCTION BY FAMILIES 



The following record indicates how these losses by extinction are 

 divided among the various mammalian families: 



Bears (Ursidae), 17 



Spiny rats and their relatives (Echimyidae), 15 



Cattle, sheep, goats, and antelopes (Bovidae), 10 



Hamsterlike rodents (Cricetidae), 8 



Antillean insectivores (Nesophontidae), 6 



Leaf -nosed bats (Phyllostomidae), 6 



Kangaroos and their relatives (Macropodidae), 5 



Wolves and foxes (Canidae), 5 



Horses, zebras, and asses (Equidae), 5 



Ground sloths (Megalonychidae), 4 



Cats (Felidae), 4 



Bandicoots (Peramelidae), 3 



Old World rats (Muridae), 3 



Deer (Cervidae), 3 



Giant rats (Dinomyidae), 2 



Dasyures and their relatives (Dasyuridae), 1 



Phalangers and their relatives (Phalangeridae), 1 



Solenodons (Solenodontidae), 1 



Shrews (Soricidae), 1 



Long-legged bats (Natalidae), 1 



Lemurs (Lemuridae), 1 



Giant ground sloths (Megatheriidae), 1 



Heptaxodon (Heptaxodontidae), 1 



Weasels and their relatives (Mustelidae), 1 



Steller's Sea-cow (Hydrodamalidae), 1 



There is the clearest sort of significance in the losses sustained 

 by the larger predatory mammals as a group (Ursidae, Canidae, 



