46 ANIMALS OF THE PAST 
as the Mylodon or Morotherium, these ani- 
mals, though belonging to a group whose head- 
quarters were in Patagonia, having extended 
their range as far north as Oregon. That the 
tracks seemed to have been made by a biped, 
rather than a quadruped, was due to the fact 
that. the prints of the hind feet fell upon and 
obliterated the marks of the fore. Still, a little 
observation showed that here and there prints 
of the fore feet were to be seen, and on one 
spot were indications of a struggle between 
two of the big beasts. The mud, or rather 
the stone that had been mud, bears the im- 
prints of opposing feet, one set deeper at the 
toes, the other at the heels, as if one animal 
had pushed and the other resisted. In the 
rock, too, are broad depressions bearing the 
marks of coarse hair, where one creature had 
apparently sat on its haunches in order to use 
its fore limbs to the best advantage. Other 
footprints there are in this prison-yard; the 
great round “spoor” of the mammoth, the 
hoofs of a deer, and the paws of a wolf (?), indi- 
cating that hereabout was some pool where all 
these creatures came to drink. More than this, 
