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| | Dolphins |
 | | Dolphins once were hunted commercially, especially for the small quantity of valuable oil extracted from parts of the head and used to lubricate delicate watch mechanisms. |
 | | Because of the ability of dolphins to learn and perform complex tasks in captivity, their continuous communications with one another, and their ability, through training, to approximate the sounds of a few human words, some investigators have suggested that the animals might be capable of learning a true language and communicating with humans. |
 | | The bottle-nosed dolphin is classified as Tursiops truncatus, the common dolphin as Delphinus delphis, and the tucuxi dolphin as Sotalia fluviatilis. |
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