Gotta love someone that looks after the tiny, not top of the page wildlife. Great job, love the whimsy too. 

We feed and shelter a lot of songbirds, and a huge flock of &^$%*# blackbirds, Grackles suck, but they are part of the plan. Costs a small fortune, but they are right there outside of our Kitchen windows. My Wife treats them like fambly. Hats off to you for providing shelter, and nesting opportunity.