The talk will explore the natural world and the processes that depend on the absence of artificial light. It will emphasize the issues that birds have with artificial lighting. I’ll also include some information on bird-friendly windows. It will cover issues of navigation (& migration), reproduction, circadian rhythms, photoperiodism, competition, predation, and general habitat protection. I’ll also touch on some issues that humans have with artificial light at night too. We’ll review what we can do to extend our protection of birds (and ourselves) to the nighttime.