Jack Dykinga / Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) Avra Valley, Saguaro National Park, Tucson Mountains, Arizona, USA, August 2015. Long exposure with lightning trigger.

Jack Dykinga / Lightning storm at twilight with Saguaro cactus (Carnegiea gigantea) Avra Valley, Saguaro National Park, Tucson Mountains, Arizona, USA. June 2015. Long exposure with lightning trigger.

Philippe Clement / Rock art in the Tucson Mountains, created by the Hohokam Indians, showing geometrical shaped petroglyphs, Saguaro NP, Arizona, USA May 2007

Jack Dykinga / Saguaro Cactus (Carnegiea gigantea) with new flowers emerging at the tip of its limb, Tucson Mountains, Saguaro NP, Arizona, USA

Jack Dykinga / Saguaro Cacti (Carnegiea gigantea) with detail of the cactus spines, Tucson Mountains, Saguaro NP, Arizona, USA

Jack Dykinga / Signal Hill petroglyphs at sunset with Saguaro Cacti (Carnegiea gigantea) and Tucson Mountains in the background, Saguaro National Monument, Arizona, USA

Jack Dykinga / Arizona poppies (Kallstroemia grandiflora) blooming amongst Mesquite (Prosopsis sp) trees with Santa Catalina mountains in background. Post summer monsoon rain, evening light. Sonoran Desert, Catalina...

Jack Dykinga / Dust and sand storm sweeping across Sonoran Desert at sunset to Picacho Peak, Picacho Peak State Park, Arizona, USA. August, 2018.

Jack Dykinga / Arizona poppy (Kallstroemia grandiflora) blooming amongst Mesquite (Prosopsis sp) trees with Santa Catalina mountains in background. Post summer monsoon rains, evening light. Sonoran Desert, Catalina...

Jack Dykinga / Caltrops summer poppies (Kallstroemia grandiflora) blooming amid mesquite trees (Prosopis sp.) infront of the Santa Catalina Mountains. July, after summer monsoon rains. Catalina State Park, near Tucs...

Jack Dykinga / Desert agave (Agave deserti) Sonoran Desert near Tucson Mountains, Arizona, USA. Taken with digital focus stacking.

Jack Dykinga / Boulders near Windy Point, Santa Catalina Mountains, Coronado National Forest, with Catalina Mountain ridges and the Tucson Mountains, Arizona, USA. September 2016.

Jack Dykinga / Geology Vista, with granite boulders against the Tucson's city lights under the Milky Way, Santa Catalina Mountains, Coronado National Forest, Arizona, USA, September.

Jack Dykinga / American bobcat (Lynx rufus baileyi) yawning and resting. Santa Catalina Mountains, Coronado National Forest, Tucson, Arizona, USA, July.

Jack Dykinga / American bobcat (Lynx rufus baileyi) resting on patio, Santa Catalina Mountains, Coronado National Forest, Tucson, Arizona, USA, July.

Jack Dykinga / American bobcat (Lynx rufus baileyi) resting on shade 'sails' over patio in garden. Santa Catalina Mountains, Coronado National Forest, Tucson, Arizona, USA, July.

Jack Dykinga / Lines of Saguaro cacti (Carnegiea gigantea) at dawn with the snowy north face of the Santa Catalina Mountains dominated by Table Mountain near Tucson, Arizona, USA

John Cancalosi / Aravaipa Canyon Wilderness, an 11 mile long canyon that cuts through the north end of Galiuro Mountains. Tucson, Federal Wilderness Area, USA

Philippe Clement / Rock art in the Tucson Mountains, created by the Hohokam Indians, showing geometrical shaped petroglyphs, Saguaro NP, Arizona, USA May 2007

Philippe Clement / Rock art in the Tucson Mountains, created by the Hohokam Indians, showing geometrical shaped petroglyphs, Saguaro NP, Arizona, USA

Philippe Clement / Rock art, created by the Hohokam Indians, showing spiral petroglyph with the Tucson Mountains in the background, Saguaro NP, Arizona, USA

Philippe Clement / Rock art, created by the Hohokam Indians, showing spiral petroglyph with the Tucson Mountains in the background, Saguaro NP, Arizona, USA

Jack Dykinga / Full moon rising over Saguaro Cacti (Carnegiea gigantea) at sunset, Tucson Mountains, Saguaro National Monument, Arizona, USA

Jack Dykinga / Saguaro Cacti (Carnegiea gigantea) silhouetted at sunset in the Tucson Mountains West unit, Saguaro NP, Arizona, USA

David Kjaer / Saguaro Cactus and view over Tucson from Catalina Mountains, Arizona USA

Tim Fitzharris / Saguaro (Carnegiea gigantea) cactus with holes made by woodpeckers, Tucson Mountains, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cacti, Tucson Mountains, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cacti in desert, Tucson Mountains, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cactii, Tucson Mountains, Saguaro National Park, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cactii in desert, Tucson Mountains, Saguaro National Park, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cactii, Tucson Mountains, Saguaro National Park, Arizona

Tom Vezo / Brown-crested Flycatcher (Myiarchus tyrannulus), Santa Rita Mountains, Arizona

Tom Vezo / Painted Redstart (Myioborus pictus) male perching in Pine tree, Santa Catalina Mountains, Tucson, Arizona

Mark Moffett / Convergent Lady Beetle (Hippodamia convergens) mass on branch during migration, Mt Lemmon, Tucson, Arizona

Mark Moffett / Convergent Lady Beetle (Hippodamia convergens) mass on Mt Lemmon, Tucson, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cacti, Tucson Mountains, Saguaro National Park, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) cacti at sunset, Tucson Mountains, Saguaro National Park, Arizona