Washington State Bird American Goldfinch TeeWashington State Bird American Goldfinch Tee. The American Goldfinch delays nesting later than almost any North American songbird, waiting until mid summer when thistle is in full seed then building a nest so tightly woven it can hold water. Washington's state bird also does a full seasonal molt, meaning the dull olive bird at your winter feeder transforms into that electric breeding yellow by June, right as coast rhododendron blooms pink across