Play the video above to see these stories on AZ Illustrated Nature: Monday, March. 24:

CO RIVER FLOWS: The U.S. and Mexico are holding a historic "pulse flow" of water on the river, which will allow the water to flow into a delta of the river that has been depleted for decades. The project is part of a "groundbreaking agreement" known as Minute 319.

IRONWOOD FOREST NATL MONUMENT: Ironwood Forest National Monument is named after the ironwood tree, one of the longest living trees in the Sonoran desert. This monument, west of Marana, encompasses more than 100,00 acres and is home to other important Sonoran desert species, in addition to the ironwood.

COOPER CENTER TURNS 50: The Cooper Center for Environmental Learning, also known as "Camp Cooper," is celebrating its 50th anniversary this year. The center has served more than 100,000 students since it was established. The center is now managed as part of cooperative effort between Tucson Unified School District and the UA's College of Education.

PRICKLY PEAR PARK: We visit a park where Pima County is growing multiple species of prickly pear cactus.

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