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 pahistris. 



Cotton-Tail Rabbit Lepus palustris mallurus. 



Domestic Rabbits, various breeds (Nursery stock.) 



SQUIRRELS AND MARMOTS (Sciuridae) 



Thirteen-Lined Spermophile Spermophilus 13-lineatus. 



Desert Spermophile Spermophilus leitcurus. 



Richardson Spermophile Spermophilus rirharclsoni. 



Woodchuck A rctomgs monax. 



Prairie Dog Cynomys ludovicianus. 



European Squirrel Sciurus vulgaris. 



Mexican Squirrel Sciurus aureogaster. 



Central American Squirrel Sciurus variabilis. 



Cuban Squirrel Sciurus chrysurus. 



Variable Squirrel Sciurus griseo-flavus. 



Gray Squirrel Sciurus carolinensis. 



Black Squirrel Sciurus carolinensis riiger. 



