How Do Dolphins Sleep?
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How Do Dolphins www.dolphins-world.com Sleep?
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All mammals sleep, and dolphins are no exception. How do they do?
Transcript of How Do Dolphins Sleep?
How Do Dolphins
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Sleep?
and dolphins are no exception.
All mammals
sleep
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Dolphin’s brains, like ours, are divided into two hemispheres.
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However
While one brain hemisphere sleeps the other maintains breathing duties, motor behaviors and possibly also some vigilance against predators.
dolphins sleepdifferent than us.
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they often lay motionlessly at the water surface or at the bottom of a pool, or they might swim slowly, sometimes with one eye closed, surfacing from time to time to breathe.
Dolphins appear to sleep or rest many times throughout the day and night.
When dolphins are in sleep mode
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theorize that some animals have developed this ability to help them detect approaching predators or to periodically rise to the surface to breathe and
monitor wave patterns, which keeps them from drowning.
Researchers
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dolphins seemingly enter a fully asleep state where both eyes are closed.
respiration is automatic; a tail kick reflex keeps the blowhole above the water if necessary.
In captivity
In this case
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reach this state.
Extensive research found new facts about how the brain of bottlenose dolphins works.
Anesthetized dolphins initially show a tail kick reflex
but it is not known if dolphins in the wild
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Calf dolphins
Scientists in California and Russia have discovered that dolphins, including the killer whale mothers and calves do not sleep during the first few months of the new baby's life.
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says the sleep patterns he and his colleagues observed in the babies are "just the reverse" of all other mammals, which normally sleep the most after birth and gradually taper down to adult levels as they age.
"This is a challenge for the idea that sleep is necessary for brain and body growth".
Jerome Siegel, a neurobiology researcher,
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The Bottlenose Dolphin- by Stephen Leatherwood, Randall R. Reeve
The Dolphin in the Mirror: Exploring Dolphin Minds and Saving Dolphin Lives - By Diana Reiss.
Baby Dolphins Don't Sleep. UCLA Brain Research Institute. October 22, 2012.
American Psychological Association. Monitoring animal sleep.
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