151. Clangula clangula americana. 20 in.

Head puffy, or slightly crested. Male with greenish head and a round white spot between bill and eye. Female with a brownish head and white speculum.

Notes. - A hoarse croak, rarely uttered.

Nest. - In cavities of hollow trees near ponds or on the banks of streams. 0 to 10 grayish green eggs (2.30 x 1.70): June.

Range. - Breeds from the northern parts of the northern tier of states, northward; winters throughout the U. S.