Rob Tilley / Agave close up abstract (Agave sp) Botanical Garden, San Miguel de Allende, Mexico

John Cancalosi / Harris antelope squirrel (Ammospermophilus harrisii) on cactus, Sonoran Desert, Arizona, USA

John Cancalosi / Harris antelope squirrel (Ammospermophilus harrisii) on cactus, Sonoran Desert, Arizona

John Cancalosi / Harris' antelope squirrel (Ammospermophilus harrisii) Sonoran Desert, Arizona

John Cancalosi / Grey cracker butterfly (Hamadryas februa) on Hecho Cactus (Pachycereus pectinaboriginum) Sonora, Mexico

John Cancalosi / Whitethroat Woodrat nest (Neotoma albigula), 2-3 ft high, Sonoran Desert, Arizona, USA

John Cancalosi / Desert cottontail rabbit {Sylvilagus audubonii} Sonoran desert, Arizona, USA.

John Cancalosi / Round tailed ground squirrel {Spermophilus tereticaudus} on cactus, Arizona, USA

Tom Vezo / Harris' antelope squirrel {Ammospermophilus harrisii} Tucson, Arizona, USA

John Cancalosi / Curve billed thrasher (Toxostoma curvirostre) on cactus Arizona USA, Sonoran Desert.

John Cancalosi / Curve billed thrasher (Toxostoma curvirostre) on cactus Arizona USA, Sonoran Desert.