Other burrowing species seem always to fix
upon some spot where there is a bank or a sudden depression in the soil,
or where there is rank herbage, or a bush or tree, about the roots of
which to begin their kennel. They are averse to commence digging on a
clear level surface, either because it is not easy for them where they
have nothing to rest their foreheads against while scratching, or
because they possess a wary instinct that impels them to place the body
in concealment whilst working on the surface, thus securing the
concealment of the burrow after it is made. Certain it is that where
large hedges have been planted on the pampas, multitudes of opossums,
weasels, skunks, armadillos, &c., come and make their burrows beneath
them; and where there are no hedges or trees, all these species make
their kennels under bushes of the perennial thistle, or where there is a
shelter of some kind. The vizcacha, on the contrary, chooses an open
level spot, the cleanest he can find to burrow on. The first thing that
strikes the observer when viewing the vizcachera closely is the enormous
size of the entrance of the burrows, or, at least, of several of the
central ones in the mound; for there are usually several smaller outside
burrows. The pit-like opening to some of these principal burrows is
often four to six feet across the mouth, and sometimes deep enough for a
tall man to stand up waist-deep in. How these large entrances can be
made on a level surface may be seen when the first burrow or burrows of
an incipient vizcachera are formed.
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