Jack Dykinga / Sunset at Yaki Point on the South Rim with stratified rim rocks and minute storm clouds inside the canyon below, Grand Canyon National Park, Arizona, USA.

Jack Dykinga / Rainbow after a storm over Mount Hayden, Point Imperial, North Rim, Grand Canyon National Park, Arizona, USA.

Mary McDonald / Broad billed hummingbird (Cynanthus latirostris) AZ, USA Madera Canyon, Arizona

HUW CORDEY / Chuckwalla lizard sunning {Sauromalus obesus} Grand Canyon, AZ, USA

Carol Walker / Arabian stallion trotting in paddock, Phoenix, Arizona, USA

Jack Dykinga / Quartermaster Canyon overlooking west into the Colorado River gorge at dawn, Grand Canyon West Hualapai Indian Reserve, Mojave Desert, Arizona, USA

Jack Dykinga / Sunrise on stratified rim rock tower at Grandview Point with meandering Colorado River riffle below, Grand Canyon National Park, Arizona, USA.

John Cancalosi / Regal horned lizard. {Phrynosoma solare} Sonoran desert, AZ, USA

John Cancalosi / Vermillion flycatcher (Pyrocephalus rubinus) perched on branch, AZ, USA

John Cancalosi / Portrait of Northern cardinal (Cardinalis cardinalis) male perched on branch, AZ, USA

John Cancalosi / Portrait of Mourning dove (Zenaida macroura), Sonoran Desert, AZ, USA

Nigel Bean / Gambel's quail (Callipepla gambelii) male, perched on Saguaro cactus, Sonoran Desert, AZ, USA