Daniel Heuclin / Sand Verbena (Abronia angustifolia) White Sands National Park, New Mexico, USA

Daniel Heuclin / Discarded drinks cans / litter on the sand. White Sands National Park, New Mexico, USA

Shattil & Rozinski / The Boar's Tusk and Killpecker Dunes, Red Desert, Wyoming, USA

Shattil & Rozinski / Jonah oil and gas drill field, Red Desert, Wyoming, USA

Shattil & Rozinski / Aerial view of Jonah oil and gas drill field, Red Desert, Wyoming, USA

Shattil & Rozinski / Trail marker post for the Mormon Trail in Red Desert NP, Wyoming, USA

Shattil & Rozinski / The Boar's Tusk viewed through a line of power cables, Red Desert NP, Wyoming, USA

Shattil & Rozinski / Sunflowers {Helianthus sp} flowering in the Great Sand Dunes NP, Colorado, USA

Shattil & Rozinski / The Boar's Tusk, Red Desert NP, Wyoming, USA

John Cancalosi / Greater earless lizard, male in breeding colours {Cophosaurus texanus} Arizona, USA, captive

John Cancalosi / Harris' hawk at nest in saguaro cactus with chicks, Sonora desert, Arizona, USA.

Tom Vezo / Cooper's hawk {Accipiter cooperii} on Saguaro cactus skeleton, Arizona, USA.