Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) and Boojum tree (Fouquieria columnaris) in Sonoran Desert, rainbow in background. Catavina, Valle de los Cirios Reserve, Baja California, Mexico.

Jack Dykinga / Night blooming birdcage evening primrose (Oenothera deltoides) with the Sheep Hole Mountains in the background at sunset, BLM (Bureau of Land Management) land, Mojave Desert, California. March 2014.

Jack Dykinga / Cardon cactus (Pachycereus pringlei) and Biznaga/Barrel cactus (Ferocactus diguetii),growing at the edge of the sea, CONANP protected area.Catalina Island, Sea of Cortez, Baja Sur, Mexico. February 20...

Jeff Foott / Boojum tree (Fouquieria columnaris) and Mexican giant cardon (Pachycereus pringlei) in Sonoran Desert. Catavina, Valle de los Cirios Reserve, Baja California, Mexico. 2013.

Jeff Foott / Boojum tree (Fouquieria columnaris) with leaves turning yellow in drought, alongside Mexican giant cardon (Pachycereus pringlei), in Sonoran Desert. Near Bahia de Los Angeles, Baja California, Mexico....

Jeff Foott / Boojum tree (Fouquieria columnaris) and Mexican giant cardon (Pachycereus pringlei) amongst rocks in Sonoran Desert, at sunset. Baja California, Mexico. 2017.

Jeff Foott / Boojum tree (Fouquieria columnaris) with leaves turning yellow in drought, alongside Mexican giant cardon (Pachycereus pringlei), in Sonoran Desert. Near Bahia de Los Angeles, Baja California, Mexico....

Jeff Foott / Boojum tree (Fouquieria columnaris) and Mexican giant cardon (Pachycereus pringlei) amongst rocks in Sonoran Desert. Baja California, Mexico. 2017.

Jeff Foott / Boojum tree (Fouquieria columnaris) and Mexican giant cardon (Pachycereus pringlei) in Sonoran Desert. Baja California, Mexico. 2020.

Jeff Foott / Boojum tree (Fouquieria columnaris) and Mexican giant cardon (Pachycereus pringlei) in Sonoran Desert. Near Bahia de Los Angeles, Baja California, Mexico. 2020.

Jeff Foott / Pitahaya agria (Stenocereus gummosus) and Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert. Near Bahia de Los Angeles, Baja California Sur, Mexico.

Jeff Foott / Mexican giant cardon (Pachycereus pringlei) flowers and buds. Near Bahia de Los Angeles, Baja California, Mexico. March.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei), close up of spines on top of young plant. Valley of the Giants, San Felipe, Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei). Valley of the Giants, San Felipe, Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei), close up of spines. Valley of the Giants, San Felipe, Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) growing amongst rocks. Catavina, Valle de los Cirios Reserve, Baja California, Mexico. 2013.

Jeff Foott / Cholla (Cylindropuntia sp) and Mexican giant cardon (Pachycereus pringlei) cacti in Sonoran Desert. Catavina, Valle de los Cirios Reserve, Baja California, Mexico. 2013.

Jeff Foott / Cholla cactus (Cylindropuntia sp) and Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert. Catavina, Valle de los Cirios Reserve, Baja California, Mexico. 2013.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert. Valley of the Giants, San Felipe, Baja California, Mexico. 2020.

Jeff Foott / Mexican giant cardon (Pachycereus pringlei) cacti in Sonoran Desert. Valley of the Giants, San Felipe, Baja California, Mexico. 2020.

Jeff Foott / Mexican giant cardon (Pachycereus pringlei), two young cacti amongst flowering Desert sand verbena (Abronia villosa) during spring super bloom. Northern Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei), close up of stem with bud of new branch. Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) stem with flowers and buds. Near Bahia de Los Angeles, Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) stem with flowers and buds. Near Bahia de Los Angeles, Baja California, Mexico.

Jeff Foott / Climbing milkweed (Funastrum cynanchoides) on Mexican giant cardon (Pachycereus pringlei). Catavina, Central Baja California, Mexico.

Jeff Foott / Climbing milkweed (Funastrum cynanchoides) on Mexican giant cardon cactus (Pachycereus pringlei). Catavina, Central Baja California, Mexico.

Jeff Foott / Climbing milkweed (Funastrum cynanchoides) on Mexican giant cardon cactus (Pachycereus pringlei). Catavina, Central Baja California, Mexico.

Jeff Foott / Climbing milkweed (Funastrum cynanchoides) amongst spines of Mexican giant cardon (Pachycereus pringlei). Catavina, Central Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) amongst Desert sand verbena (Abronia villosa) during spring super bloom. Northern Baja, Mexico.

Jeff Foott / Mexican giant cardon (Pachycereus pringlei) cacti outside Mission San Francisco Javier. Near Loreto, Baja California Sur, Mexico. 2020.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert in stormy light, rainbow overhead. Catavina, Valle de los Cirios Reserve, Baja California, Mexico.

Jeff Foott / Rainbow over Sonoran Desert with Mexican giant cardon cactus (Pachycereus pringlei). Catavina, Valle de los Cirios Reserve, Baja California, Mexico.

Jeff Foott / Rainbow over Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert. Catavina, Valle de los Cirios Reserve, Baja California, Mexico.

Jeff Foott / Senita cactus (Pachycereus schottii) in Sonoran Desert, Mexican giant cardon (Pachycereus pringlei) in background. Valley of the Giants, Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert. Valley of the Giants, San Felipe, Baja California, Mexico.

Jeff Foott / Mexican giant cardon cactus (Pachycereus pringlei) in Sonoran Desert, root system visible above eroded soil, Valley of the Giants, San Felipe, Baja California, Mexico. 2013.

Jeff Foott / Senita cactus (Pachycereus schottii) in Sonoran Desert, Mexican giant cardon (Pachycereus pringlei) in background. Valley of the Giants, Baja California, Mexico.

Doc White / Cardon cactus (Pachycereus pringlei) in desert habitat, Baja California, Mexico.

Doc White / Cardon cactus (Pachycereus pringlei) in desert habitat, Baja California, Mexico.

Cyril Ruoso / Elephant cactus (Pachycereus pringlei) in flower with bees looking for pollen, Vizcaino Desert, Baja California, Mexico, April.

Cyril Ruoso / Black-chinned hummingbird (Archilochus alexandri) flying towards an Elephant cactus (Pachycereus pringlei) flower, Vizcaino desert, Baja California, Mexico, May.

Cyril Ruoso / Raven (Corvus corax) screaming perched on Elephant cactus (Pachycereus pringlei) Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Boojum tree (Fouquieria columnaris), Elephant cactus (Pachycereus pringlei) and Datilillo (Yucca valida) silhouetted at night, Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Elephant cactus (Pachycereus pringlei) with flowers open just before dawn, Vizcaino Desert, Baja California, May.

Cyril Ruoso / Male Hooded oriole (Icterus cucullatus) perched on top of Elephant cactus (Pachycereus pringlei) Vizcaino Desert, Baja California, Mexixo, May.

Cyril Ruoso / Gila woodpecker (Melanerpes uropygialys) flying from nest hole in the trunk of an Elephant cactus (Pachycereus pringlei) Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Elephant cactus (Pachycereus pringlei) at night, Vizcaino Desert, Baja California, Mexico, May.

Cyril Ruoso / Male Gambel's quail (Callipepla gambelii) perched on top of an Elephant cactus (Pachycereus pringlei) Vizcaino Desert, Baja California, Mexico, May.