NEW YORK ZOOLOGICAL PARK. 131 



BRAZILIAN TREE PORCUPINE. 



Nature in which the production of all animal life is care- 

 fully balanced; for a part of the exhibition is composed of 

 representative species of mammals that, in turn, prey upon 

 the serpents, thus keeping even the destroyers of the smaller 

 injurious creatures within bounds ! 



During the past two years the collection of rodents has 

 been steadily growing in importance. The following is a 

 list of the species on exhibition at the close of the year 1912 : 



RODENTS IN THE ZOOLOGICAL PARK. 



hares and rabbits (Leporidae) 



Mexican Swamp Rabbit Lepus jialustris. 



Cotton-Tail Rabbit Lepus palustris mall-urus. 



Domestic Rabbits, various breeds (Nursery stock.) 



SQUIRRELS AND MARMOTS (Sciuridae) 



Thirteen-Lined Spermophile Spermophilus 13-Uneatus. 



Desert Spermophile Spermophilus leueurus. 



Richardson Spermophile Spermophilus richardsoni. 



Woodchuck A rctomys mona.v. 



Prairie Dog Cynomys ludovieianus. 



European Squirrel Seiurus vulgaris. 



Mexican Squirrel Seiurus aureogaster. 



Central American Squirrel Seiurus variabilis. 



Cuban Squirrel Seiurus chrysurus. 



Variable Squirrel Seiurus griseo-flavtis. 



Gray Squirrel Seiurus earolinensis. 



Black Squirrel Seiurus earolinensis niger. 



