Play the video above to see these stories on AZ Illustrated Nature: Monday, Dec. 16:

DARK SKIES: A meeting with Tucsonans working on behalf of the International Dark-Sky Association, which aims to preserve areas without artificial light. Scientists and environmentalists say dark skies are seen as an essential part of astronomy and even beneficial for many plants and animals.

NOCTURNAL CREATURES: Addressing the role of importance dark skies, and essentially nights, have in plants and animals' livelihoods.

THE END OF NIGHT: We meet with Paul Bogard, Ph.D., from James Madison University, who is visiting Tucson Nov. 18 as part of the Steward Observatory's Public Evening Lectures. Bogard is the author of "The End of Night: Searching for Natural Darkness in an Age of Artificial Light" The lectures are organized by Thomas Fleming, PhD, from the University of Arizona.

AZ Illustrated Nature is produced by Tony Paniagua. Contact him at