The ornamental design for game bird feeder, as shown and described.
FIG. 1 is a perspective view of the feeder;
FIG. 2 is a top plan view of the feeder; and,
FIG. 3 is an elevational view of the feeder; all sides being identical to
the side shown except for the hole in the conical top and the chain by
which the top is attached to the body of the feeder, both of which are
shown in the figure, the feeder is symetrical about a vertical axis.