Jack Dykinga / Yucca (Yucca schottii) plants growing amongst Bigtooth maple trees (Acer saccharum grandidentatum) in autumn, Huachuca Mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Yucca (Yucca schottii) plants growing amongst Bigtooth maple trees (Acer grandidentatum) in autumn, Huachuca Mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Yucca {Yucca schottii} and Bigtooth maples {Acer grandidentatum} in autumn colours, Huachuca mountains, Coronado National Forest, Arizona, USA

John Cancalosi / Mobile Surveillance Unit vehicle, U.S. Border Patrol, Huachuca Mountains, Arizona, USA. Uses radar-infrared technology and a video camera to monitor United States and Mexican border

John Cancalosi / Mobile Surveillance Unit vehicle, U.S. Border Patrol, Huachuca Mountains, Arizona, USA. Uses radar-infrared technology and a video camera to monitor United States and Mexican border

Michael & Patricia Fogden / Mountain Treefrog (Hyla eximia), Huachuca Mountains, Arizona

Jack Dykinga / Yucca {Yucca schottii} amongst Bigtooth maple {Acer grandidentatum} trees in autumn colours, Huachuca mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Yucca {Yucca schottii} amongst Bigtooth maple {Acer grandidentatum} trees in autumn colours, Huachuca mountains, Coronado National Forest, Arizona, USA

Jack Dykinga / Bigtooth maple {Acer saccharum grandidentatum} trees in autumn colours, Huachuca mountains, Coronado National Forest, Arizona, USA

Michael & Patricia Fogden / Banded Rock Rattlesnake (Crotalus lepidus klauberi) basking, Huachuca Mountains, Arizona

Michael & Patricia Fogden / Banded Rock Rattlesnake (Crotalus lepidus klauberi) basking and eating, Huachuca Mountains, Arizona

Michael & Patricia Fogden / Ridge-nosed Rattlesnake (Crotalus willardi) gravid female basking in Huachuca Mountains, Arizona