I recently built a small skateboard ramp in my backyard using eco-friendly plywood. Unfortunately, I noticed that local squirrels and birds seemed to be attracted to it and even started gnawing on parts of the structure. I′m worried about their safety and potential harm to the ramp itself. How can we ensure that eco-friendly plywood structures are safe for urban wildlife while still being functional for sports activities like skateboarding? Any tips or materials that work best?