Enrique Lopez-Tapia / Madagascar ocotillo (Alluaudia procera) Berenty Reserve, Madagascar.

Konrad Wothe / White-footed Sportive Lemur (Lepilemur leucopus) in Alluaudia ascendens tree, Andohahela National Park, South Madagascar, Africa

Konrad Wothe / White-footed Sportive Lemur (Lepilemur leucopus) in Alluaudia procera tree, Berenty Reserve, South Madagascar, Africa

Konrad Wothe / Tree in Thorny forest (Alluaudia procera) near Andohahela National Park, South Madagascar, Africa

Suzi Eszterhas / Ring-tailed Lemur (Lemur catta) mother with week-old baby feeding on Madagascan Ocotillo (Alluaudia procera) cactus, Berenty Private Reserve, Madagascar

Suzi Eszterhas / Ring-tailed Lemur (Lemur catta) mother with week-old baby feeding on Madagascan Ocotillo (Alluaudia procera) cactus, Berenty Private Reserve, Madagascar

Cyril Ruoso / Ring-tailed Lemur (Lemur catta) trio feeding on fresh leaves of the Madagascan Ocotillo (Alluaudia procera) vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Verreaux's Sifaka (Propithecus verreauxi) sitting in Madagascan Ocotillo (Alluaudia procera) sticking out tongue, vulnerable, Berenty Private Reserve, Madagascar

Cyril Ruoso / Madagascan Ocotillo (Alluaudia procera) forest in the Spiny Desert, Berenty Private Reserve, Madagascar

Cyril Ruoso / Madagascan Ocotillo (Alluaudia procera) showing fresh leaves, Berenty Private Reserve, Madagascar

Barrie Britton / Verreaux's Sifaka (Propithecus verreauxi) leaping between trees in Spiny Forest, with Madagascar ocotillo (Alluadudia procera) Ifotaka, Madagascar. Photograph taken on location for BBC 'Wild Madagasc...

Barrie Britton / Verreaux's Sifaka (Propithecus verreauxi) leaping between trees in Spiny Forest, with Madagascar ocotillo (Alluadudia procera) Ifotaka, Madagascar. Photograph taken on location for BBC 'Wild Madagasc...