56 The Mammals of Colorado 
While perhaps not social animals in the strict sense of the 
word, yet every large rock slide has usually several of them 
dwelling there, and the inhabitants may be seen, when not 
making hay, sitting about on rocks in the sun, taking life 
easy. They have a curious little cry, difficult to describe, 
but it is a jerky, squeaky sort of noise, and is frequently 
heard when the animals are out on the rocks. As a rule they 
FIG. 19. " HAY PILE " OF CONY, Ocliotona saxaiiUs 
E. R. Warren, Photo. 
are not shy, and by careful walking may be approached 
quite closely. 
But little seems to be known of the breeding habits; the 
young are born during the summer, but the number is not 
known. The mammae are six in number and it is not likely 
that a litter exceeds that number, and four or five are most 
likely to be the average. 
SUBORDER SIMPLICIDENTATA 
With only two incisors in the upper jaw, the enamel 
