The Belief That Where Large Quadrupeds Exist, The Vegetation
Must Necessarily Be Luxuriant, Is The More Remarkable,
Because The Converse Is Far From True.
Mr. Burchell observed
to me that when entering Brazil, nothing struck him more
forcibly than the splendour of the South American vegetation
contrasted with that of South Africa, together with
the absence of all large quadrupeds.
In his Travels, [6] he has
suggested that the comparison of the respective weights (if
there were sufficient data) of an equal number of the largest
herbivorous quadrupeds of each country would be extremely
curious. If we take on the one side, the elephant, [7] hippopotamus,
giraffe, bos caffer, elan, certainly three, and probably
five species of rhinoceros; and on the American side,
two tapirs, the guanaco, three deer, the vicuna, peccari,
capybara (after which we must choose from the monkeys to
complete the number), and then place these two groups
alongside each other, it is not easy to conceive ranks more
disproportionate in size. After the above facts, we are compelled
to conclude, against anterior probability, [8] that among
the mammalia there exists no close relation between the
bulk of the species, and the _quantity_ of the vegetation, in
the countries which they inhabit.
With regard to the number of large quadrupeds, there
certainly exists no quarter of the globe which will bear
comparison with Southern Africa. After the different statements
which have been given, the extremely desert character
of that region will not be disputed. In the European division
of the world, we must look back to the tertiary epochs,
to find a condition of things among the mammalia, resembling
that now existing at the Cape of Good Hope. Those
tertiary epochs, which we are apt to consider as abounding
to an astonishing degree with large animals, because we
find the remains of many ages accumulated at certain spots,
could hardly boast of more large quadrupeds than Southern
Africa does at present. If we speculate on the condition
of the vegetation during these epochs we are at least bound
so far to consider existing analogies, as not to urge as
absolutely necessary a luxuriant vegetation, when we see
a state of things so totally different at the Cape of Good
Hope.
We know [9] that the extreme regions of North America,
many degrees beyond the limit where the ground at the depth
of a few feet remains perpetually congealed, are covered by
forests of large and tall trees. In a like manner, in Siberia,
we have woods of birch, fir, aspen, and larch, growing in a
latitude [10] (64 degs.) where the mean temperature of the
air falls below the freezing point, and where the earth is so
completely frozen, that the carcass of an animal embedded in it
is perfectly preserved. With these facts we must grant, as
far as _quantity alone_ of vegetation is concerned, that the
great quadrupeds of the later tertiary epochs might, in most
parts of Northern Europe and Asia, have lived on the spots
where their remains are now found. I do not here speak of
the kind of vegetation necessary for their support; because,
as there is evidence of physical changes, and as the animals
have become extinct, so may we suppose that the species of
plants have likewise been changed.
These remarks, I may be permitted to add, directly bear
on the case of the Siberian animals preserved in ice. The
firm conviction of the necessity of a vegetation possessing
a character of tropical luxuriance, to support such large
animals, and the impossibility of reconciling this with the
proximity of perpetual congelation, was one chief cause of
the several theories of sudden revolutions of climate, and of
overwhelming catastrophes, which were invented to account
for their entombment. I am far from supposing that the
climate has not changed since the period when those animals
lived, which now lie buried in the ice. At present I
only wish to show, that as far as _quantity_ of food _alone_ is
concerned, the ancient rhinoceroses might have roamed over
the _steppes_ of central Siberia (the northern parts probably
being under water) even in their present condition, as well
as the living rhinoceroses and elephants over the _Karros_
of Southern Africa.
I will now give an account of the habits of some of the
more interesting birds which are common on the wild plains
of Northern Patagonia: and first for the largest, or South
American ostrich. The ordinary habits of the ostrich are
familiar to every one. They live on vegetable matter, such
as roots and grass; but at Bahia Blanca I have repeatedly
seen three or four come down at low water to the extensive
mud-banks which are then dry, for the sake, as the Gauchos
say, of feeding on small fish. Although the ostrich in its
habits is so shy, wary, and solitary, and although so fleet
in its pace, it is caught without much difficulty by the Indian
or Gaucho armed with the bolas. When several horsemen
appear in a semicircle, it becomes confounded, and does
not know which way to escape. They generally prefer running
against the wind; yet at the first start they expand
their wings, and like a vessel make all sail. On one fine
hot day I saw several ostriches enter a bed of tall rushes,
where they squatted concealed, till quite closely approached.
It is not generally known that ostriches readily take to the
water. Mr. King informs me that at the Bay of San Blas,
and at Port Valdes in Patagonia, he saw these birds swimming
several times from island to island. They ran into
the water both when driven down to a point, and likewise
of their own accord when not frightened: the distance
crossed was about two hundred yards. When swimming,
very little of their bodies appear above water; their necks
are extended a little forward, and their progress is slow.
On two occasions I saw some ostriches swimming across the
Santa Cruz river, where its course was about four hundred
yards wide, and the stream rapid.
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