Due to the variety of habitats and temperatures, biodiversity in Suriname is considered high. In October 2013, 16 international scientists researching the ecosystems during a three-week expedition in Suriname's Upper Palumeu River Watershed catalogued 1,378 species and found 60—including six frogs, one snake, and 11 fish—that may be previously unknown species. According to the environmental non-profit Conservation International, which funded the expedition, Suriname's ample supply of fresh water is vital to the biodiversity and healthy ecosystems of the region.