The Zoology Of Tierra Del Fuego, As Might Have Been
Expected From The Nature Of Its Climate And Vegetation, Is
Very Poor.
Of mammalia, besides whales and seals, there is
one bat, a kind of mouse (Reithrodon chinchilloides), two
true mice, a ctenomys allied to or identical with the tucutuco,
two foxes (Canis Magellanicus and C. Azarae), a sea-otter,
the guanaco, and a deer.
Most of these animals inhabit only
the drier eastern parts of the country; and the deer has never
been seen south of the Strait of Magellan. Observing the
general correspondence of the cliffs of soft sandstone, mud,
and shingle, on the opposite sides of the Strait, and on some
intervening islands, one is strongly tempted to believe that the
land was once joined, and thus allowed animals so delicate
and helpless as the tucutuco and Reithrodon to pass over.
The correspondence of the cliffs is far from proving any
junction; because such cliffs generally are formed by the
intersection of sloping deposits, which, before the elevation
of the land, had been accumulated near the then existing
shores. It is, however, a remarkable coincidence, that in the
two large islands cut off by the Beagle Channel from the
rest of Tierra del Fuego, one has cliffs composed of matter
that may be called stratified alluvium, which front similar
ones on the opposite side of the channel, - while the other is
exclusively bordered by old crystalline rocks: in the former,
called Navarin Island, both foxes and guanacos occur; but in
the latter, Hoste Island, although similar in every respect,
and only separated by a channel a little more than half a mile
wide, I have the word of Jemmy Button for saying that
neither of these animals are found.
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