Dolphins are members of the Odontoceti, a suborder of cetaceans - that is, all whales, dolphins and porpoises - that means "toothed whales." There are approximately 40 species of dolphins and all are carnivores, primaril... More »

Though it swims in the ocean, a dolphin is not a fish. Instead, dolphins are marine mammals, meaning they have all of the physical characteristics that require a mammalian classification but live in the oceans. More »

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Dolphins generally give birth to just one baby at a time, which is referred to as a calf. Unlike many animals, dolphins rarely have multiple births. After enduring a gestation period of 9 to 17 months, expectant dolphins... More »

All whales, dolphins and porpoises belong to an order called cetaceans. Totaling approximately 78 species, cetaceans are divided into either of two groups: the mysticeti and the odontoceti, or baleen whales and toothed w... More »

Dolphins are types of cetacean mammals that are closely related to porpoises and whales. They range in size from 4 feet to 30 feet and weigh up to 10 tons. Dolphins have a single blowhole, cone-shaped teeth and a pronoun... More »

Dolphins sleep by a process called unihemispheric slow-wave sleep. This kind of sleep is believed to help dolphins and other creatures recover from their daily activities. More »

Dolphins grow to different sizes, with the bottlenose dolphin growing to be approximately 10 to 14 feet and weighing 1,100 lbs. while the orca whale grows to approximately 21 to 23 feet long and weights in at 6 to 10 ton... More »