Tape or any other adhesive material in the enclosure or anywhere on the lid is very dangerous. Even if you don't think they can get to it, avoid using tape inside or outside on the enclosure and check all new objects for stickers and remove any found.

For enclosures near windows, keep in mind that the angle of the sun changes depending on the time of year. A safe place in summer may no longer be safe in winter or fall as the sun gets lower in the sky. Be sure that they are safe from direct sunlight at all times.

Do not build enclosures out of processed wood that may emit fumes or place such wood products inside an enclosure. Do not use cedar or pine. Plywood and rot resistant wood can be treated with harmful chemicals. Always be sure to use a wood product that is certified non toxic. Be sure that all materials placed in an enclosure are free of toxic paints, glues, and chemicals. These can cause liver and kidney damage over time.

Do NOT under any circumstances use a substrate that could contain cedar or pine products. This includes using potting soil as a substrate.