Claudio Contreras / Prickly pear (Opuntia sp.) growing on coastline, Socorro Island, Revillagigedo Archipelago National Park (Socorro Islands), Pacific Ocean, Western Mexico, November, Honorary Mention in the third natio...

Jack Dykinga / Hairy bird's foot morning glory (Ipomoea leptotoma) flower over Prickly pair (Opuntia sp) Catalina State Park, near Tucson, Arizona, USA, August.

Floris van Breugel / Beavertail cactus (Opuntia basilaris) in otherwise stark desert, Alabama Hills, Owen's Valley, California, USA May

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

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) eating Opuntia (Opuntia sp) cactus, introduced from South America, it became a very important food subsistance for Lemurs, cattle and even humans, vulnerable, Berenty P...

Rolf Nussbaumer / Northern mockingbird (Mimus polyglottos) adult fighting with Golden-fronted Woodpecker (Melanerpes aurifrons) female over Texas Prickly Pear Cactus (Opuntia lindheimeri) Dinero, Lake Corpus Christi, S...

John Abbott / Giant prickly pear cactus (Opuntia echios var. gigantea) amongst carpetweed, Plazas Island, Galapagos

Rolf Nussbaumer / Golden-fronted Woodpecker (Melanerpes aurifrons), male perched on Texas Prickly Pear Cactus (Opuntia engelmanni). Laredo, Webb County, South Texas, USA, April.

Floris van Breugel / Cholla cactus (Opuntia) backlit by setting sun, Anza Borrego State Park. California, USA. April 2009.

Suzi Eszterhas / Digger Bee (Melissodes sp) pollinating Engelmann Prickly Pear (Opuntia engelmannii) flower, Red Corral Ranch, Texas

Jack Dykinga / Dense stands of Prickly pear cactus (Opuntia sp) in Tamaulipas, Mexico

Jack Dykinga / Gopher snake (Pituophis sp) amongst Lechuguilla (Agave lechuguilla) and prickly pear cacti (Opuntia macrocentra), Maderas del Carmen Natural Reserve, Mexico