Below this region flow the streams of the Great Basin, none of which reach the sea, but either terminate in lakes having no outlet or else vanish in sloughs or " sinks."
In length and only a few inches deep. Such bodies often become nothing but vast sheets of liquid mud, and are called " mud lakes," a term most frequently applied to the sloughs fed by Quinn's river.
A salivary gland degenerates when its nerve-supply is cut off.
Among the lakes, sloughs and stubble-fields of the prairies, teal, ducks, coots and geese are found in abundance.
Here and there faint depressions occur, occupied by marshy sloughs, or floored with a rich black soil of pestglacial origin.
Nearer the Great Lakes the till sheets are trenched only by the narrow valleys of the large streams; marshy sloughs still occupy the faint depressions in the till plains, and the associated moraines have abundant small lakes in their undrained hollows: hence these drift sheets are of late Pleistocene origin.
Eared grebes and ring-billed gulls breed on the sloughs of the plains, and rarely the white pelican nests about the lake shores.