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 Depression and bar-headed goose ("Anser indicus"). Only a few individuals of great white pelican ("Pelecanus onocrotalus") remain in the Great Lakes Basin in Mongolia. They nest in catchment areas of rivers and lakes that have abundant fish and vegetation. Although the total number of fish species in the region is low, a large percentage of those that do occur are endemic or near-endemic, especially from the genera "Oreoleuciscus" (Altai osmans), "Thymallus" (graylings) and "Triplophysa" (a stone loach genus). Great Lakes Depression The Great Lakes Depression (, "Ikh Nuuruudyn Khotgor"), also called the Great Lakes' Hollow is a large semi-arid depression in