Jack Dykinga / Saguaro cacti (Carnegiea gigantea) in bloom with Foothill paloverde (Cercidium microphyllum) Sonoran Desert National Monument, Arizona, USA, April.

Kristel Richard / Band of wild Mongolian horses running on plains at the foot of Dungurukh Uul mountain, near the border with China and Kazakhstan, Bayan-Olgiy aymag, Mongolia. September.

Daniel Heuclin / Red coachwip or Red racer (Masticophis flagellum piceus) eating Sceloporus lizard, Catalina foothill, Arizona, June.

Steven Kazlowski / North American porcupine (Erethizon dorsatum) pup feeds on Alaskan high brush cranberries in the foothills of the Takshanuk Mountains, South-East Alaska, USA

Philippe Clement / The chapel Sankt Johann at Val di Funes / Villnösstal, in the foothills of the Dolomites, Italy. July 2010.

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 / Yellow paloverde (Cercidium microphyllum) flowering amongst Saguaro (Carnegiea gigantea). In foothills on north side of Santa Catalina Mountains, Coronado National Forest, Arizona, USA. May 2019.

Mary McDonald / Rufous-booted racquet-tail (Ocreatus underwoodii peruanus) male hummingbird landing, Amazonian foothill forest, Ecuador. April.

Jouan Rius / Rainbow over Saguaro cacti (Carnegiea gigantea), Organ Pipe Cactus (Stenocereus thurberi) and Foothills Palo Verde tree (Cercidium microphyllum), Organ Pipe Cactus National Monument, Sonoran Desert, A...

Jouan Rius / Yellow or Foothills Palo Verde tree (Cercidium microphyllum), Arizona, USA. April 2014.

Doug Wechsler / Stream in wet foothill forest in west Andes Mountains, Province El Oro, Buenaventura Biological Reserve, Ecuador, February

Doug Wechsler / Interior of foothill tropical forest, Province El Oro, Buenaventura Reserve, Ecuador