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 do sleep with one eye open, a skill that is necessary for survival. When dolphins sleep, only half of their brains shut down, which enables them to remain vigilant to the threat of predators and to regulate thei... More »

Some interesting facts about dolphins are that they belong to the order Cetacea, are mammals that can live in either saltwater or freshwater environments, depending on the species, and have very good hearing and vision. ... More »

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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 »

Dolphins start communicating from birth by squawking, whistling, clicking and squeaking, according to National Geographic. Members of a pod sometimes vocalize in varying patterns simultaneously, much like people holding ... More »

Dolphins are close to the top of their food chain with few natural predators other than sharks. When faced by a predator, dolphins often circle, head butt or use their tails to hit the other animal in self defense. Accor... More »

Dolphins survive by living within groups to protect one another, by eating various food found throughout the ocean and by breathing when they surface. Their bodies also help to support them after millions of years of evo... More »