The ornamental design of a birdfeeder, as shown and described.
FIG. 1 is a top perspective view of the bird feeder showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a front elevational view thereof.
The rear elevational view is identical to FIG. 4 while the left and right
side elevational views are identical to FIG. 4 except for the topmost
hanging ring.