Smithsonian Report, 1941. — Walker 



Plate 8 



1. Skull of marmot or woodchuck with both upper and lower incisors grown so long that the animal could 

 not gnaw or eat normally. The left upper incisor had penetrated the roof of the mouth. 



2. Left, end of tail of coypu or nutria, probably originally injured by fighting, but worn to the bone at the 

 tip by dragging on concrete; right, foot of ring-tailed monkey or capuchin, showing area on bottom of 

 heel from which the skin and flesh had been worn to the bone as a result of walking on the concrete floor. 

 The animals give no evidence of pain caused by such injuries. 



