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Wherever the valisneria grows in quantity, as in the Chesapeake Bay and some rivers, like the Hudson, there the canvass-backs resort, and are rarely seen elsewhere. They do not eat the leaves but only the white soft roots, which they dive for and pluck up with great dexterity.
"The canvass-back is known in natural history as Anas valisneria, and this specific name is given to it because it feeds upon the roots of an aquatic plant, a species of `tape-grass, or `eel-grass; but botanically called `Valisneria, after the Italian botanist, Antonio Valisneri.
The latter, as Lucien explained, feeds upon the roots of the valisneria; but for these it is obliged to dive to the depth of four or five feet, and also to spend some time at the bottom while plucking them up.
The latter, as Lucien had said, feeds upon the roots of the valisneria; but for these it is obliged to dive to the depth of four or five feet, and also to spend some time at the bottom while plucking them up.
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