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Figure 7: Bottle trap design: (a) inverted 600 mL plastic bottle, (b) hole bored into base of bottle, (c) foam square cut to bottle base, (d) foam square place around bottle base with fishing line tied through holes and around square, (e) canvas strip, with hole, slits around hole, dowels at each end, and zip-ties added, (f) canvas attached to inside of bottle with hot glue (g) fishing weight added to bottle with fishing line, and (h) excess canvas trimmed from foam square.