into the floor and sides of the box. place one at each corner of the floor and one on each side toward the bottom of the box.
any useful plans for a flying squirrel nesting box will include instruction on placing the entrance hole as well as the size it should be. the entrance should be near the top of one of the sides or the front of the box. the size of the entrance is important because it needs to be large enough for the squirrels to come and go, but not so large that a predator could get inside. your nesting box plans should indicate whether they're for southern 