6o The Mammals of Colorado 
been told of mountain lions being killed by hunters which were 
so weak that they made no attempt to escape, and examination 
showed the stomach to be perforated by porcupine quills, 
which were the cause of the animals' weakness. When one 
considers the fact that the only unprotected portions of a 
porcupine are the under parts, it seems strange that any animal 
FIG. 22. YELLOW-HAIRED PORCUPINE, Erethizou epixantJius. 
The same individual as in Fig. 21, but higher up the tree. 
should be able to kill one without getting paws and nose filled 
with quills. The remains of porcupines which have been 
killed by other animals generally consist of the skin and 
perhaps a few bones and part of the entrails; the skin shows 
that the victim had been turned on its back and opened on 
