How Do Blue Whales Sleep?

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So how can they sleep and not drown? Observations of bottlenose dolphins in aquariums and zoos, and of whales and dolphins in the wild, show two basic methods of sleeping: they either rest quietly in the water, vertically or horizontally, or sleep while swimming slowly next to another animal.

You may wonder, how do whales sleep without breathing? These animals are equipped with a much larger lung system than Orca, which allows them to exchange more air with each breath, and have a higher tolerance for carbon dioxide. So whales can sleep literally with one eye open. (plus one brain hemisphere 'awake') to remember to breathe.

Similarly one may ask, what animal sleeps the longest? KoalasKoalas are the longest sleeping-mammals, about 20–22 hours a day.

Besides above, why can't whales survive out of water? Cetacean stranding often leads to death due to dehydration. Whales have an incredibly thick layer of insulating blubber. Without the water to keep them cool, they overheat and lose too much water via evaporation from their lungs.

Likewise, why can't whales live on land? Whales can only survive a few hours on land. They breathe the air just fine. The problem is that their fat holds in too much heat. When the water is not there to absorb the heat, they die.

How long can a whale hold its breath?

The longest ever recorded dive by a whale was made by a Cuvier's beaked whale. It lasted 222 minutes and broke the record for diving mammals. Other whales can also hold their breath for a very long time. A sperm whale can spend around 90 minutes hunting underwater before it has to come back to the surface to breathe.

Do dolphins have nipples?

Cetaceans nurse their young just like land mammals do. Unlike the exposed nipples of humans and our closer kin, the mammary glands of dolphins and porpoises are concealed inside of abdominal slits. The mother squirts the milk into the calf's mouth to account for the difficulty of underwater suckling.

How can blue whales hold their breath for so long?

Rather than keeping oxygen in their lungs like humans do, whales' bodies are specially adapted to store oxygen in their blood and muscles. They have extraordinarily high levels of the oxygen-storing proteins haemoglobin and myoglobin.

How do blue whales get enough oxygen?

Unlike fish, blue whales cannot extract oxygen from the water as they do not possess gills. Blue whales breathe by swimming to the water's surface and inhaling fresh air into their lungs through their blowhole, which is located on the top of the whale's head.

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