The Ottawa-Carleton protocol uses a large cage of roughly 2 ft × 4 ft × 4 ft with ½-inch welded wire and a floor-level nesting box as a practical pre-release reference. For tiny western species, verify that every gap is small enough to prevent escape.
- Predator-proof roof, sides, doors and floor/perimeter
- Dry nest box at ground level with natural nesting material
- Soil/leaf litter or deep digging trays, logs, roots, rocks and tunnels
- Branches and low climbing structure without turning the enclosure into a tree-squirrel cage
- Shade, rain protection and excellent drainage
- No loose string, looped fabric or wire points that can catch feet




