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

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

Claudio Contreras / Teddy-bear cholla (Cylindropuntia bigelovii) at sunrise, El Pinacate Biosphere Reserve, Sonoran desert, Mexico.

Claudio Contreras / Ocotillo (Fouquieria splendens), Teddy-bear cholla (Cylindropuntia bigelovii) and Saguaro cactus (Carnegiea gigantea) in volcanic ash field, El Pinacate Biosphere Reserve, Sonoran desert, Mexico.

Claudio Contreras / Teddy-bear cholla (Cylindropuntia bigelovii) at dawn, El Pinacate Biosphere Reserve, Sonoran desert, Mexico.

Jack Dykinga / Teddy bear cholla cacti (Opuntia bigelovii) and Saguaro cacti (Carnegiea gigantea) surrounded by flowering Scorpoinweed (Phacelia crenulata) at dawn, Sonoran Desert National Monument, Arizona, USA. Ma...

Jack Dykinga / Teddy bear cholla cacti (Opuntia bigelovii) surrounded by flowering Scorpionweeds (Phacelia crenulata) and Saguaro cacti (Carnegiea gigantea) under gathering clouds in afternoon light, Sonoran Desert...

Jack Dykinga / Saguaro cacti (Carnegiea gigantea), flowering Scorpionweeds (Phacelia crenulata) and Teddy bear cholla cacti (Opuntia bigelovii) in afternoon sunlight under rainbow and stormy skies, Sonoran Desert Na...

Jack Dykinga / Teddy bear cholla cacti (Opuntia bigelovii) and large stand of Saguaro cacti (Carnegiea gigantea) surrounded by flowering Scorpoinweed (Phacelia crenulata) in morning light, Sonoran Desert National Mo...

Jack Dykinga / Scorpionweed (Phacelia sp.) flowering on desert floor amongst Teddy bear cholla (Opuntia bigelovii) and Saguaro cacti (Carnegiea gigantea) at sunset, Sonoran Desert National Monument, Arizona, USA. Ma...

Jack Dykinga / Scorpionweed (Phacelia sp.) flowering on desert floor amongst Teddy bear cholla (Opuntia bigelovii) and Saguaro cacti (Carnegiea gigantea) at sunset, Sonoran Desert National Monument, Arizona, USA. Ma...

Jack Dykinga / Globemallow (Sphaeralcea ambigua.) flowering across desert floor with Teddy bear cholla (Opuntia bigelovii), Saguaro cacti (Carnegiea gigantea) and Prickly pear cactus (Opuntia engelmannii), Ironwood...

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,...