I feel like we should kill 2 birds with one stone: Bats and bat guano.

Guano used to be mined for gunpowder, to the point where the US annexed a few islands after the Guano Islands Act of 1856. If bat guano is usable as fertilizer, we could design some basic guano-collecting bat shelters that act like an automatic litterbox for cats.

The bats get a home, and the equivalent of a flush-toilet, while we get bats, less bugs, and plenty of batshit ideas.