Range. - North America west of the Mississippi to eastern California, breeding from the southern parts of the United States north to British Columbia and Hudson Bay and wintering from southern United States downward.

This large handsome Blackbird with bright yellow head and breast is very abundant in some parts of the west, where they nest in large colonies in sloughs and marshes, being especially abundant in the Dakotas and Manitoba. The nests are made of strips of rushes, skillfully woven together and attached to upright cane near the surface of the water. They lay from four to six eggs having a grayish white ground color, finely specked and spotted with shades of brown and gray; sixe 1.00 x .70,

Light blue-green.

Yellow-headed Blackbird.

Grayish white.