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Cut a square out of an aluminum soda can and then trace & cut a hole in the middle that matches the bird house opening. Attach to outside of the opening. It helps to keep bigger birds from enlarging the hole and evicting the chicks inside.
Thanks for the feedback.
I have had some birdhouses in years past and never had a problem with larger birds enlarging the holes. Is it a certain type of larger bird that would do this?
In any case, could I use another piece of pallet wood on the outside instead of an aluminum soda can? I think that would look better. In the picture you posted, it looks like an additional piece of wood on the front attached to the bird house.
If not, I think I might sandwich the aluminum soda can between the bird house and the extra pallet wood piece on the front. If the goal is for the aluminum soda can to prevent enlarging of the hole, the larger bird might be able to make the outside pallet piece hole larger but would be stopped by the aluminum sandwiched between the wood.
I'll have to go back to the Audobon site for more information. I know there are some ways better than others for making a panel removable for cleanout. And drain holes, too.