The golden discovery
In 1986, primatologist Dr. Patricia Wright was searching the rainforests of southeastern Madagascar for the greater bamboo lemur, a species thought to be extinct. Instead, she found a species entirely new to science: the golden bamboo lemur (Hapalemur aureus). This discovery directly led to the formation of Ranomafana National Park on May 31, 1991, to protect the habitat of this rare primate. The park now covers 41,600 hectares (161 square miles) of mountainous rainforest, an area that is now part of the Rainforests of the Atsinanana UNESCO World Heritage Site.
The golden bamboo lemur is a scientific mystery. It feeds almost exclusively on another local endemic, the giant bamboo Cathariostachys madagascariensis. The growing shoots of this bamboo contain high concentrations of cyanide, about 0.015%. Each day, an adult lemur eats around 500 grams of bamboo. This means it ingests approximately 12 times the lethal dose of cyanide for an animal of its size, yet it suffers no ill effects. The precise biological mechanism that allows the lemur to metabolize the poison remains unknown. This physiological trait is a subject of ongoing research at the Centre ValBio, a modern research station established by Stony Brook University located adjacent to the park.
A reservoir of species
The park's terrain is rugged, with elevations ranging from 800 to 1,200 meters, creating a mix of lowland rainforest and cloud forest habitats. This topography supports immense biodiversity. In addition to its 12 species of lemur, the park contains 118 species of birds (30 of which are endemic to the park), 90 species of butterflies, and 112 species of frogs. The reptile count includes 62 distinct species, such as the satanic leaf-tailed gecko (Uroplatus phantasticus) and numerous chameleons.
The golden bamboo lemur shares its habitat with two other bamboo-eating lemurs: the greater bamboo lemur (Prolemur simus) and the Ranomafana grey bamboo lemur (Hapalemur griseus ranomafanensis). These three species avoid competition by specializing. The greater bamboo lemur eats the pith of the mature bamboo culms, the golden bamboo lemur eats the new shoots and leaf bases, and the smaller grey bamboo lemur feeds on the leaves. This niche partitioning allows for their coexistence in the same bamboo forests. Research and conservation efforts are managed through the Centre ValBio, which was founded by Patricia Wright and facilitates the work of hundreds of scientists each year.