Cyanotoxin which is why they are usually green or blue. Cyanobacteria are found almost everywhere; in oceans, lakes and rivers as well as on land. They flourish in Arctic and Antarctic lakes, hotsprings and wastewater treatment plants. They even inhabit the fur of polar bears, to which they impart a greenish tinge. Cyanobacteria produce potent toxins, but they also produce helpful bioactive compounds, including substances with antitumour, antiviral, anticancer, antibiotic and antifungal activity, UV protectants and specific inhibitors of enzymes. Cyanotoxins are often implicated in what are commonly called "red tides" or "harmful algal blooms". Lakes and oceans contain many single-celled
Great Lakes Twa where Batwa harvest clay under an informal communal tenure system are fast becoming collectivised rice-growing plantations due to a 2005 land policy change. They face another crisis as they lose another occupation that defines Batwa identity and provides social livelihood. The Great Lakes Twa speak distinct dialects of Rundi and Kiga. Great Lakes Twa The Great Lakes Twa, also known as "Batwa", "Abatwa" or "Ge-Sera", are a pygmy people who are generally assumed to be the oldest surviving population of the Great Lakes region of central Africa, though currently they live as a Bantu caste. Current populations are found in