E.

Bartlett, "uses its bill like a duck by throwing the water out at the corners.

" Its chief food, however, is grass, which it crops like the common goose.

In this latter bird the lamellae of the upper mandible are much coarser than in the common duck, almost confluent, about twenty-seven in number on each side, and terminating upward in teeth-like knobs.

The palate is also covered with hard rounded knobs.