Saguaro National Park

This saguaro cactus is nearly bulging at its seams. The Sonoran Desert region in this part of Saguaro National Park has had a rainy period and the saguaros were able to soak up the rain water and store it in its ribs. As the weather becomes hotter and drier, the saguaro will use the stored water and the ribs will shrivel and become more ridged.