Along the flood-plains of the larger rivers are fertile " bottomlands," but the ruggedness of the plateau country as a whole has retarded the development of the state, much of which is still sparsely populated.
The Virginia deer is common in the bottomlands; a few beaver still frequent the remoter streams; in the higher portions are still a few black bears and pumas, besides the lynx, the Virginia varying hare, the woodchuck, the red and the fox squirrel and flying squirrels.
The popular conception of Bolivia is that of an extremely rugged mountainous country, although fully three-fifths of it, including the Chiquitos region, is composed of low alluvial plains, great swamps and flooded bottomlands, and gently undulating forest regions.
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