Do not wait for leaders; do it alone, person to person.Mother Teresa
Even if the only thing you have to do it with is duct tape.
See the side of the house? Those dark spots in the lower right are bird poo--clearly, the bird had been eating berries of some kind. And those squares are vents.
On the right hand side, the middle slat was missing and birds were flying in and out. I worried that they were building a nest in the vent. It doesn't appear to be the case; however, I decided to remove the temptation.
I moved the bottom slat up to the middle and replaced the lowest one with...duct tape!
In our family, you either fix it with duct tape or a hammer. This time a hammer wouldn't work. And so far, the duct tape is holding.