https://thenextweb.com/tech/2018/06/15/this-dutch-town-uses-high-tech-streetlights-to-keep-their-bats-happy/

Have you ever heard of a bat-friendly city? Me neither. But the Dutch town of Zuidhoek-Nieuwkoop is claiming to be the first – and probably only – bat-friendly town in the world. The town is home to many rare and vulnerable plant and animal species, among them a number of rare bat-species.

And apparently, bats, although being blind, are bothered by streetlights. The light that’s emitted from typical streetlights disturbs bats’ internal sensors and rhythms and affects their feeding patterns, inner compass, and general nocturnal behavior. Bats typically feed on a variety of insects, and these tend to swarm around lights.