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:
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