How do dolphin sleep?
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Dolphins shut down half of their brain at a time to give rest, however, it has been recently found that age may be a factor in this.  <See Below>\n\nBeing a new mother is exhausting, but if you're a dolphin or a killer whale, you may not be getting any extra sleep-time to recover, in fact you may not be getting any sleep at all. Scientists in California and Russia have discovered that both dolphin and killer whale mothers and calves apparently go with no sleep for the first few months of the new baby's life.
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DUDE ABOVE YOU NEED HELP___SORRY I AM NOT ANSWERING YOUR QUESTION !!! BUT THE DOLPHIN DUDE IS TOO WEIRD!!!!! HELP HIM GOD!!!
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What is the difference between a dolphin and a porpoise? I heard this question asked, on Johnny Carson. And, Johnny decided that a dolphin was a mammal, and a porpoise was a fish. Wrong. They are both mammals, and are very closely related. The porpoises have a rounded head, while the dolphins have a protruding snout. They are smaller members of the toothed whale family, to which killer whales and sperm whales belong.\n\nTo complicate things, there are a couple of fish which are also called dolphins. I assume that these are sometimes called "dolphin fish" to avoid confusion. But, the well-known dolphins are those cute mammals, like Flipper (who is a bottle-nosed dolphin).\n\nMammals have hair, breath air, give birth to live babies (platypuses and echidnas lay eggs), and feed milk to their young. Whales breath air (they can hold their breaths for long times), give birth to live babies, and feed milk to their young. Where is their hair? Evidently, they have a small amount of hair around their blow-holes, those holes, in the top of their heads, that they breath through.\n\nThe toothed whales are among the most intelligent of all animals. The killer whale (orca) apparently has a brain mass to body mass ratio (a rough measure of intelligence) which is greater than that of humans. Incidentally, while toothed whales are predators, there is no record of any killer whale ever having killed a human being.
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Ok, I know that the bit about sharks not breathing if they're still is still taught at school, and essentially it has some point. It's true that gill oxygenation is better when the water flow through the branchial area is greater. \nBut sharks DO indeed stop swimming, they can rest near the bottom of the ocean (as if sleeping) and they use the pumping motion of the floor of their mouth (their mostly immobile tongue) to help water move through the gills. \nBut as I've said, immobile sharks lie mostly near the ocean floor. This is because they're rather dense with respect to water (they don't have swimming bladders like bony fishes do), although their enormous, fat-filled liver increases their buoyancy significantly (along with other physiological characteristics). When they swim, sharks can keep themselves in midwater; the movements of the trunk and tail generate the necessary thrust to keep them from falling to the bottom.
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A baby dolphin is called a calf. They will drink milk from their mothers, and then eventually become carnivores when they are old enough.
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A dolphin has a three chambered stomach, similar to an ungulate (cow or deer), pointing further to its evolution from a terrestrial ancestor. Since dolphins do not chew their food, the mastication of their meal is taken care of in their first or fore stomach. The majority of digestion is processed in the main stomach or second chamber. The last section of their stomach, the pyloric stomach, takes care of the remainder of their digestion prior to the contents emptying into the intestinal region.
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whatt mahi mahi? a dolphin?
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Yes. deep sleep ! LOL
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Dolphins have the vocal capabilities to talk like humans and communicate with us. It's true.
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Hedgehogs are nocturnal.  Here is a website with alot of information about them.\n\nhttp://www.angelfire.com/punk2/walktheplank/hedgehogs.html
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It depends on the kind of dolphin you're talking about. \n\nThe most commonly thought-of kinds of dolphins, which look a lot like porpoises, are air-breathing mammals. They are typically 5 to 8 feet long.\n\nBut there is also a dolphin fish, also called a pompano or mahi-mahi, which is a true fish and not a mammal.  Dolphin fish are brightly colored, have large heads, and are typically two to three feet long. These are the kind of dolphins seen on the insignia of US Navy submariners.
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How do you sleep at night?
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Goldfish do rest. Sleeping is a concept that is different for the various species of life in our world. Many species do not require the type of sleep that humans require. Fish do REST but, if you are wondering if they run into a cave and float aimlessly while they sleep? No, fish do not sleep. They will slow down their metabolism and REST in a safe corner of their world. Also, fish activity becomes slower in the evening and when water temperatures drop when they are in safe places.\n\nAND:\n\nMost all fish spend time in an energy-saving state that can be called "rest", and we might even call their behavior "sleep", though it is probably \n\ndifferent than "sleep" in most land animals. Many fish, like Bass and perch, rest on or under logs at night. Coral reef fish active in the day, hide and rest \n\nin crevices and cracks in the reef to avoid being eaten at night. The resting behavior of fish is very different from their behavior the rest of the day. Many \n\nminnows, for example, which are very active in schools during the day, scatter and remain motionless in shallow water at night. Many fish "rest" or \n\n"sleep" during the day and are active at night instead, but almost all fish sleep. There are some animals that never stop swimming, like many species of\n\n\nshark, however, they HAVE to keep moving to push water through their mouths in order to breathe, and they may still sleep while moving,\n\n\nwe just don't know yet.
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yes they are aroused, but not by the same things as us. Yes they have the same mechanical processes as we do for an orgasm.  Although I'm sure they don't have the emotional hangups that we do.  And dolphins aren't the only other animals that have sex for recreation.  There is a primate called the Bonobo that pretty much has sex all the time. Male-female, same sex, masturbation....whatever, they don't care.
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YOUR LEGS SHOULD STAY TOGETHER AND MOVE IN THE MOTION OF A DOLPHIN. ARMS START OUT IN THE FRONT OF YOU TOGETHER PUSH DOWN WITH HANDS AS YOU ARE MAKING A YOUR ARMS BUTTERFLIED OUT OF WATER OVER HEAD AND PUSH WATER DOWN HEAD COMES EVER OTHER STROKE FOR BREATHE BODY SHOULD HAVE SMOOTH MOVE EVERYTHING WORKS TOGETHER VERY HARD TO DESCRIBE IN WORDS EASIER TO SHOW
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The answer is a combination of several factors.\n\nThe skin is designed so as to limit "wrinkling" while swimming. (hydrodynamics) If u look at the skin closely, they consist of placoid scales which r smooth in one direction (swimming direction), and rough in the other direction.\n\nSharks r seriously buffed up, which aids in generating work.\n\nFins stabilise the body to prevent it from swimming upside down or in a circle\n\nThey belong to the chondrichthyes... cartilaginous fishes. This skeletal system is lighter than boney frames and allows for greater flexibility. Both characteristics COULD help in swimming. (There r, however, many fast marine animals with boney frames such as the dolphin or swordfish).\n\nThe tail is the main propulsion force. Which works in coordination with it's respiratory and circulatory system. As water passes over the gills, the lamellae r oxygenated, and at the same time release waste products (co2). So, if the shark swims slowly, the respiration rate decreases... and if he doesn't swim at all, he suffocates. I guess sharks swim fast because they have to. Haha. I hope that's helpful.
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they tell to sleep without doing anything