A CAGE NET (3) INCLUDES A PLURALITY OF SCREEN SHEETS (31) EACH HAVING AN UPPER SECTION (311) AND A TAPERED LOWER SECTION (312). THE UPPER SECTIONS (311) ARE INTERCONNECTED SIDE BY SIDE TO FROM A SURROUNDING WALL (300), AND THE LOWER SECTIONS (312) ARE INTERCONNECTED SIDE BY SIDE TO FORM A BOTTOM WALL (301). THE LOWER SECTIONS (312) ARE FOLDED INWARDLY FROM THE RESPECTIVE UPPER SECTIONS (311) AND HAVE TAPERED ENDS EXTENDING TO A SUBSTANTIALLY CENTRAL PART OF THE BOTTOM WALL (301). THE CAGE NET (3) CAN BE FABRICATED CONVENIENTLY AT LOW COST. THE MOST ILLUSTRATIVE DRAWING IS FIG. 3.