A bear which became a minor star in Los Angeles, with over 24,000 Twitter followers, was returned to the wild Sunday after being found asleep in a tree.
The oilfield lies some 4,200 meters below the shallow waters of the northern part of the Caspian Sea and is highly pressured (770 bar of initial pressure).
The list also includes Lake Baikal, Hawaii, the Galapagos Islands, the Amazon River basin, the Mediterranean Sea, the Yangdze, Indus and Gang Rivers, San Felix and Juan Fernández islands and the Kerguelen Archipelago.
Populations of beluga sturgeon have declined by nearly 90% in recent decades due to the high demand for black caviar, inadequate management, and habitat degradation.