NEW YORK ZOOLOGICAL PARK. F 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.............05.5-5 Lepus palustris. 
Cotton-Tail Rabbit.................0-060 0 Lepus palustris mallurus. 
Domestic Rabbits, various breeds.......... (Nursery stock.) 
SQUIRRELS AND MARMOTs (Sciuridae) 
Thirteen-Lined Spermophile.............-. Spermophilus 13-lineatus. 
Desert Spermophile............--+2eeee eee Spermophilus leucurus. 
Richardson Spermophile............-...++5 Spermophilus richardsoni. 
Woodebuck ss ieces ensues aries ere saeee ties Arctomys monaz. 
Prairie Dope: 20:5 accuse ves saseneiw sien Cynomys ludovicianus. 
European Squirrel..........-----se0eeeeee Sciurus vulgaris. 
Mexican Squirrel..........--..ses eee ee eens Sciurus aureogaster. 
Central American Squirrel..........-...5-. Sciurus variabilis. 
Cuban Squirrel...........0-20 002 c eee eee Sciurus chrysurus. 
Variable Squirrel..........0-+.-0eeeeeeeee Sciurus griseo-flavus. 
Gray Squirrel..........6- 5000s c eee ee eens Sciurus carolinensis. 
Black Squirrel........-..00 02sec eee ee eee Sciurus carolinensis niger. 
