Exterior lighting fixture depicting a blue heron
FIG. 1 is a side view of the exterior lighting fixture depicting the blue heron; 
     FIG. 2 is a front view of the lighting fixture depicted in FIG. 1; 
     FIG. 3 is a rear view of the lighting fixture depicted in FIG. 1; and, 
     FIG. 4 is a view of the lighting fixture of FIG. 3 from a perspective looking up from the ground. 
     The broken lines are for illustrative disclosure and form no part of the claimed design.