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

Nick Hawkins / Galapagos prickly pear (Opuntia echios), a vulnerable species. Isabela Island, Galapagos.

Jeff Vanuga / Giant prickly pear (Opuntia echios) cacti, Plazas Island, Galapagos, Ecuador.

Shane P. White / Opuntia (Opuntia echios) cacti, Santa Cruz Island, Galapagos Islands, Ecuador

Steve Gettle / Opuntia (Opuntia echios) cacti, Galapagos Islands, Ecuador

Pete Oxford / Opuntia cactus (Opuntia echios var. barringtonensis) and yacht in the background, Santa Fe Island. Galapagos.

Michele Westmorland / Prickly pear cactus (Opuntia echios) Isabela Island, Galapagos Islands.

Michael Durham / Opuntia (Opuntia echios) cacti surrounded by Sea-purslane (Sesuvium edmonstonei), South Plaza Island, Galapagos Islands, Ecuador

Michael Durham / Opuntia (Opuntia echios) cactus surrounded by Sea-purslane (Sesuvium edmonstonei), South Plaza Island, Galapagos Islands, Ecuador

Stefan Huwiler / Prickly Pear Cactus (Opuntia echios) in dusty landscape. Puerto Egas Bay, Santiago Island, Galapagos Islands, Ecuador, South America, September 2008.

Pete Oxford / Opuntia (Opuntia echios) cacti with fruit, Tortuga Bay, Santa Cruz Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Land Iguana (Conolophus subcristatus) near Opuntia (Opuntia echios) cacti on South Plaza Island, Galapagos Islands, Ecuador