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Cetaceans are distributed in all the world’s oceans from the far polar reaches to the Equator. They concentrate in areas of increased biological productivity, such as upwellings where there is an abundant supply of food. Some species are coastal, and some are pelagic, dwelling farther offshore. The centres of the ocean basins appear not to have any concentrations of whales or dolphins. Some small cetaceans are distributed in major river systems, particularly river dolphins of the family Platanistidae. Members of this family are found in the Amazon, Orinoco, La Plata, Yangtze, Ganges, and Indus rivers and surrounding drainage waters. Members ...(100 of 8017 words)