Moth populations are rapidly declining in many parts of the world. Joe Bowden, an entomologist with the Canadian Forest Service, is taking notice and urges others to do the same. While I was working in Denmark some years ago, I was introduced to light walls used to attract moths. Upon moving back to Canada a few years ago, I started to think there’s an opportunity here. …All it takes is a white surface and a light. The light attracts moths at night and they land on the white surface. Then people can take photos and share them online by uploading them to sites like iNaturalist.ca, which is a global community of naturalists. …Moths and other insects are like a canary in the coal mine when it comes to climate change. We now have moth walls in all Parks Canada locations in Atlantic Canada.