I removed this wood duck nesting box from a friends pond two days ago. They have the duck entrance propolized down to about an inch. There is a board missing from the bottom, so I put plywood shims on top of one of my boxes (I run all 8-frame med boxes) containing two frames of old comb, two of foundation and the remaining starter strips.
The next day they were re-orienting and today are hauling in loads of pollen. Questions:
1- Should I cover the top entrance and get them to use the bottom?
2- Will they expand down if I don't?
I don't want them to get crowded and swarm. My plan is to add a second box when they get this one almost full.