Floris van Breugel / Desert agave (Agave deserti) has skewered a ball of spines shed by neighboring Cholla cactus (Cylindropuntia bigelovii) Anza-Borrego State Park, California, USA March

Jack Dykinga / Close up of Saguaro cactus (Carnegiea gigantea) and Teddybear cholla (Cylindropuntia bigelovii) in evening light, Tucson Mountain Park, Arizona, USA

Jack Dykinga / Sunset light on the Kofa Mountains behind a carpet of Teddy bear cholla cacti (Cylindropuntia bigelovii) glowing in warm light. Kofa National Wildlfe Refuge, Arizona, USA. February.

Jack Dykinga / Teddy bear cholla cacti (Cylindropuntia bigelovii) Kofa National Wildlfe Refuge, Arizona, USA.

Jack Dykinga / Hillside of flowering Red owl's clover (Orthocarpus purpurascens) Brittlebush (Encelia farinosa) and Teddy bear cholla (Opuntia bigelovii) Harcuvar Mountains, Arizona, USA.

Jack Dykinga / Mexican poppies (Eschscholtzia californica) Scalloped phacelia (Phacelia crenulata) and Teddy bear cholla (Opuntia bigelovii) Tonto National Forest, Superstition Mountain Arizona, USA.

Jack Dykinga / Teddy bear cholla (Cylindropuntia bigelovii) cacti amongst Brittlebush (Encelia farinosa) flowers. Sonoran Desert in stormy morning light. Cabeza Prieta National Wildlife Refuge, Arizona, USA. March 2...

Jack Dykinga / Teddy bear cholla cactus (Cylindropuntia bigelovii) with Ocotillo (Fouquieria splendens) and flowering Brittlebush (Encelia farinosa) in background. Cabeza Prieta National Wildlife Refuge, Arizona, US...

Jack Dykinga / Teddy bear cholla (Cylindropuntia bigelovii) cacti and Ocotillo (Fouquieria splendens) with flowering Brittlebush (Encelia farinosa) in background, in morning light. Cabeza Prieta National Wildlife Re...

Jack Dykinga / Teddy bear cholla (Cylindropuntia bigelovii) cacti and Ocotillo (Fouquieria splendens) in morning light. Cabeza Prieta National Wildlife Refuge, Arizona, USA. March 2020.

Jack Dykinga / Sonoran Desert with Saguaro (Carnegiea gigantea), Teddy bear cholla (Cylindropuntia bigelovii), Ocotillo (Fouquieria splendens) and flowering Brittlebush (Encelia farinosa). Cabeza Prieta National Wil...

Jack Dykinga / Teddy bear cholla (Cylindropuntia bigelovii) cacti and Ocotillo (Fouquieria splendens) in morning light, flowerin Brittlebush (Encelia farinosa) in background. Cabeza Prieta National Wildlife Refuge,...

Claudio Contreras / Sonoran Desert with Teddy-bear cholla (Cylindropuntia bigelovii), Saguaro (Carnegiea gigantea) and Brittlebush (Encelia farinosa). El Colorado volcano in background. El Pinacate Biosphere Reserve, nor...

Claudio Contreras / Sonoran Desert with Saguaro (Carnegiea gigantea) and Teddy-bear Cholla (Cylindropuntia bigelovii) cactic, alongside Ocotillo (Fouquieria splendens). El Pinacate Biosphere Reserve, Sonoran Desert, nort...

Claudio Contreras / Teddy-bear cholla (Cylindropuntia bigelovii) in El Elegante volcano crater. El Pinacate Biosphere Reserve, northwest Mexico.

Claudio Contreras / Sonoran Desert on volcanic soil with Teddy-bear cholla (Cylindropuntia bigelovii), Saguaro (Carnegiea gigantea) and ocotillo (Fouquieria splendens). El Tecolote volcano, El Pinacate Biosphere Reserve,...

Jouan Rius / Superstition mountain and Teddy Bear cholla cactus (Opuntia bigelovii) at sunset, Lost Dutchman State Park, Arizona, USA, April.

Jouan Rius / Teddy Bear cholla cactus (Opuntia bigelovii) flowers, Lost Dutchman State Park, Arizona, USA. April.

Jouan Rius / Teddy Bear cholla cactus (Opuntia bigelovii) flowers, Lost Dutchman State Park, Arizona, USA, April 2014.

Chris Mattison / Teddy Bear Cholla (Opuntia bigelovii) Joshua Tree National Park, California, USA, May.

Chris Mattison / Teddy Bear Cholla (Opuntia bigelovii) with expansive landscape behind, Joshua Tree National Park, California, USA, May.

Floris van Breugel / Teddybear Cholla cacti (Cylindropuntia bigelovii) at sunset under a clearing storm over Anza Borrego State Park desert, California, USA, April.

Jack Dykinga / Teddybear Cholla cacti (Cylindropuntia bigelovii) in sunset light, Kofa National Wildlife Refuge, Arizona, USA

Rolf Nussbaumer / Teddy Bear Cholla Cactus (Cylindropuntia bigelovii) in field of Mexican Gold Poppy (Eschscholzia californica mexicana), Tonto National Forest, Bartlett Lake, Arizona, USA, March

Rolf Nussbaumer / Teddy Bear Cholla Cactus (Cylindropuntia bigelovii) in field of Mexican Gold Poppy (Eschscholzia californica mexicana), Tonto National Forest, Bartlett Lake , Arizona, USA, March

Philippe Clement / Loose joints of the Teddybear Cholla {Opuntia / Cylindropuntia bigelovii} drop readily and attach easily to passing animals, Organ Pipe National Monument, Arizona, USA

Philippe Clement / Teddybear Cholla {Opuntia / Cylindropuntia bigelovii}, Organ Pipe National Monument, Arizona, USA

Philippe Clement / Teddybear Cholla {Opuntia / Cylindropuntia bigelovii} in front of the Ajo Mountain Range, Organ Pipe National Monument, Arizona, USA May 2007

Barry Mansell / Teddybear cholla cactus {Cylindropuntia bigelovii} Arizona desert, USA

Patricio Robles Gil / Teddy Bear Cholla (Cylindropuntia bigelovii) and California Poppies (Eschscholzia californica) in the Sonoran Desert, Tucson, Arizona

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) cacti, Crater Range, Arizona

Tim Fitzharris / Desert Bluebell (Phacelia campanularia) flowers and Teddy Bear Cholla (Cylindropuntia bigelovii) cacti in spring, Anza-Borrego Desert State Park, California

Tim Fitzharris / Desert Bluebell (Phacelia campanularia) flowers and Teddy Bear Cholla (Cylindropuntia bigelovii) cacti in spring, Anza-Borrego Desert State Park, California

Sebastian Kennerknecht / Teddy Bear Cholla (Cylindropuntia bigelovii) cactus in desert, Blue Angels Peak, Sierra de Juarez, Colorado Desert, Sonoran Desert, California

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) cactii, Crater Range, Arizona

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) cacti in desert, Kofa Mountain, Kofa National Wildlife Refuge, Arizona

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) beneath the Superstition Mountain, Lost Dutchman State Park, Arizona

Sumio Harada / Teddy Bear Cholla (Cylindropuntia bigelovii) cactus surrounded with reproducting cholla balls, Sonoran Desert, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) and Teddybear Cholla (Cylindropuntia bigelovii) cacti covering Panther and Safford Peaks, Saguaro National Park, Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) and Teddybear Cholla (Cylindropuntia bigelovii) amid flowering Lupine and California Brittlebush (Encelia californica), Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) and Teddybear Cholla (Cylindropuntia bigelovii) amid flowering Lupine and California Brittlebush (Encelia californica), Arizona

Tim Fitzharris / Saguaro (Carnegiea gigantea) and Teddybear Cholla (Cylindropuntia bigelovii) in front of the Picacho Mountains from Picacho Peak State Park, Arizona

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) under stormy skies, Joshua Tree National Park, California

Tui De Roy / Teddy Bear Cholla (Cylindropuntia bigelovii) in Sonoran desert landscape, Puerto Remedios, Sea of Cortez, Baja California, Mexico

Jim Brandenburg / Teddy Bear Cholla (Cylindropuntia bigelovii) and poppies, Organ Pipe National Monument, Arizona

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) cacti, Crater Range, Arizona

Tim Fitzharris / Desert Bluebell (Phacelia campanularia) flowers and Teddy Bear Cholla (Cylindropuntia bigelovii) cacti in spring, Anza-Borrego Desert State Park, California

Tim Fitzharris / Teddy Bear Cholla (Cylindropuntia bigelovii) cacti, Joshua Tree National Park, California