Jack Dykinga / Penstemon (Penstemon sp) in flower against Saguaro cactus (Carnegiea gigantea) Finger Rock Canyon, Santa Catalina Mountains, Arizona, USA

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) at sunset in the foothills of the Santa Catalina Mountains, near the Sutherland Wash, Catalina State Park, Arizona, USA

Jack Dykinga / Close-up of spines of the trunk of a Saguaro cactus (Carnegiea gigantea) Caboza Prieta National Wildlife Refuge, Arizona, USA

Jack Dykinga / Cacti in snow with fog at sunrise, Saguaro National Park, Arizona, USA

Jack Dykinga / Rainbow at sunset over desert hillside with Saguaro cacti, Table Mountain in the distance, Pusch Ridge Wilderness, Coronado National Forest, Santa Catalina Mountains, Arizona, USA

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) Sand Tank Mountains, Barry M. Goldwater Range, Arizona, USA

Jack Dykinga / Saguaro cactus (Carnegia gigantea) lit up at night with star trails, Cabeza Prieta National Wildlife Refuge, Arizona, USA

Jack Dykinga / California poppies (Eschscholzia californica) flowering between the "ribs" of a dead Saguaro cactus (Carnegiea gigantea) Barry M. Goldwater Range, Arizona, USA

Jack Dykinga / Saguaro cactus (Carnegiea gigantea) twisted by exposure to frost, Maricopa Mountains Wilderness, Sonoran Desert National Monument, Arizona, USA

Jack Dykinga / Saguaro cacti (Carnegiea gigantea) silhouetted at sunrise, Sand Tank Mountains, Sonoran Desert National Monument, Arizona, USA

Jack Dykinga / Close up of Saguaro cactus (Carnegiea gigantea) and Teddybear cholla (Cylindropuntia bigelovii) in evening light, Tucson Mountain Park, Arizona, USA

Anup Shah / Ring-tailed Lemur (Lemur catta) female with infant (less than one month) riding on her back. Berenty Private Reserve, Madagascar. Oct 2008.