Why in the ocean, animals such as whales, dolphins, etc., have white bellies

It may be that white is not easy to attract predators, and it can also be better camouflaged to prey on prey.

Because their backs always shield them from most of the sun, and their stomachs are not irradiated.

It is mainly a protective color that has evolved over a long period of time, a dark color that is close to water when viewed, and a light color that is close to the sky when viewed from below.

It is a good protective color, and it is also possible that the belly is not exposed to the sun.

This allows for better adaptation to the environment and reduces the detection of natural predators.

A protective color that evolved to adapt to the living environment.

This may also be a protective color for them.

This is its protective color, which is conducive to better survival.

Because it's their eco-friendly color.

Most fish have a black back and a whitish belly, which is mainly a protective color formed over a long period of time, which is dark from the water and light from the bottom.

Whales and dolphins belong to the cetacean order among mammals. Seals belong to the order Pinnipeda among mammals. They do not belong to fish, which breathe with gills, whereas mammals and reptiles have evolved to breathe with their lungs.

Fish can breathe oxygen with their gills in the water, while mammals and reptiles must breathe by exposing their breathing space to air. There are indeed similarities with fish in terms of morphology, such as being active in the water for a long time, and they all have flippers suitable for swimming as if they were naturally selected, so the swimming efficiency is greatly increased.

Fish have several characteristics: 1 gills 2 eggs 3 inability to live on land. Whales: viviparous, and milk-fed calves are mammals Dolphins: Seals: Same whales.

Among all the marine creatures, I used to envy the whale the most, because it belongs to the largest creature in the ocean, and it can be said that there are basically no natural enemies, but there is an animal that invisibly hurts the whale, that is, the barnacle parasitic on the whale**, which can also be said to be a very shameless parasite, no matter how you shake it off, it will form a bunch of white spots on the whale**. So today, let's talk about what this barnacle is!

Barnacles will cling to stones, whales, and other places where they can survive for their own survival. And in order to be able to firmly attach to the parasite, the body will secrete a very viscous substance, which is a hundred times stronger than the 502 glue we usually use. And the simple attachment has not yet reached the requirements of barnacles, and the lower part of their bodies will be deeply rooted in the **, that is to say, if you want to parasitize on the whale, you have to embed yourself in the slippery ** of the whale.

In particular, slower and "a little lazy" whales have more barnacles on their bodies. Because the whales are slower and less impactful, they create good conditions for them to attach. Those who have obsessive-compulsive disorder or dense phobia, and the urge to help the whales pull these barnacles down in minutes, they just bully the whale brothers without hands and feet, and it is not good to tear them apart! 

Although they are all marine animals, they are also different species. It is normal for barnacles to parasitize whales.

Due to the huge size of the whales, these whales do not cause too much direct damage to the whales.

Barnacles are fatal to other marine life, but due to their large size, they do not pose a direct fatal hazard to whales.

In fact, dolphin killer whales can also have whale barnacle parasitism, but it is much less than other whales. Again, the main reason for this is their different swimming speeds and the fact that they are much more social than other cetaceans.

Both whale lice and whale barnacles are mainly parasitic on large cetaceans, and they are large cetaceans that swim slowly, such as bigfin whales, right whales, gray whales, etc. Faster swimmers and small dolphins, such as dolphins, killer whales, fin whales and blue whales, are less common.

Because whales can accept it and can endure it, but other marine life cannot.

Their genetic structure is different, so they develop differently.

Whales are large and slower than other creatures.

Whales are physically strong and slow swimming, and barnacles are prone to parasitism.

Life in the ocean, which we are familiar with, from the very beginning of single-celled organisms, to the current multicellular biological society, after hundreds of millions of years of long waiting, in modern society, the land and the sea are full of all kinds of organisms, archaeological findings, whales and dolphins in the ocean are all down from the land, so how did whales and dolphins evolve from the four animals on land to what they are now? Their ancestors could not live on land, and when they went to the ocean, their limbs were hindered from swimming, so they degraded their limbs and became fins, which evolved into what they are now.

The pelvic belt of modern whales is still degraded and can be seen in any complete whale skeleton in the museum, including dolphins. The function of the pelvic girdle is to connect the hind legs to the axial bone. This pelvic girdle means that it used to have hind legs.

Scientists have found that hind legs still appear in the early development of the modern whale fetus. That is, in today's whale genetic engineering, hind legs are also coded, but absorbed by the body before birth.

Whales are mammals and were the first to crawl on land on all fours. Later, the earth's temperature increased, and reptiles, which are ectotherms, could not adapt to the mutated environment and died in large numbers. As a result, the niche near the water source is vacant, and whales occupy this niche.

Then gradually go into the water to live, and the degenerated hind limbs are completely adapted to the aquatic life.

First of all, the vicissitudes of their living environment forced them to go into the water, and in order to be able to hunt and live in the water, their limbs gradually evolved into fins.

Animals are just a general term, those who live in the sea can be called animals, but the whales and dolphins you are talking about are different from the fish in the water, they are mammals, they have no gills, they can't breathe in the water, they breathe with their lungs, and they have to surface every once in a while to breathe. Also, they are all viviparous, and fish are all egg-laying, while dolphin whales are the same as humans, raised in the belly, and have been formed after birth, so they meet the characteristics of mammals, and finally dolphins and whales are mammals that live in the ocean (water).

All are mammals that live in water.

Reason: Because dolphins have a well-developed brain, and there are many sulcus, the more sulcus, the more developed intelligence.

The average brain weight of an adult dolphin is kilograms, the average weight of a human brain is about kilograms, and the average brain weight of an orangutan is less than kilograms. In terms of absolute weight, dolphins are the first, but in terms of the ratio of brain weight to body weight, the human brain accounts for the weight, and dolphins and orangutans only account for it.

A variety of dolphins constitute the dolphin family, which is the most diverse family of marine mammals, with a total of 37 species in 17 genera in the world, and 18 species in 13 genera in China. Dolphins have a friendly-looking appearance and a playful personality, and have always been very popular in human culture.

Scientists believe that there is a strong relationship between the weight and strength of the brain. The human brain accounts for the weight, and the dolphin brain accounts for the weight, and it can be said that the dolphin has the highest IQ except for humans. In the United States, dolphins are classified as a military aspect, and they are used to accomplish tasks that people cannot accomplish at the bottom of the ocean.

After training, they can jump fire rings, play table tennis, communicate with humans, etc. Dolphins are almost universally known for rescuing humans from sharks, as well as their companions and even sacrificing themselves, but dolphins are still a mystery to save people. They have a high sense of precaution, can recognize friend and foe, and are self-aware.

In one experiment, two scientists used the same method to teach the big star and the dolphin to turn on the lights, and the gorilla took about 200 times to teach, while the dolphin only used about 20 times.

Dolphins are the most intelligent sea creatures, and it's in their nature to be active!

It's very human, it's evolving fast.

How do marine mammals such as whales and dolphins sleep in the water without choking?

Here, first of all, we must refute the rumors, the online rumor that "dolphins don't need to sleep" is absolutely wrong, as a high-IQ mammal, even if they live in the cold, bottomless ocean, they still need to sleep. However, for many creatures in nature, they do not need at least eight hours of continuous sleep per day like humans. There are many animals whose sleep is fragmented, for example, horses only need two hours of daily sleep, and some giraffes only need to sleep for ten minutes.

Of course, there are counter-examples to everything, and there are animals that do the opposite, such as snakes, frogs, and other creatures that need to hibernate for months.

To be honest, there is still little research on the sleep of cetaceans, such as the whales sleeping vertically described above, which was accidentally photographed by divers when they went into the water a few years ago. Of course, there is a reason why whales and dolphins need some skills and methods when they sleep to avoid all kinds of environmental hazards in the ocean, which is why little is known about the sleeping conditions of whales and dolphins.

The sleep of sperm whales was first observed by humans, and after entering the sleep state of large groups of sperm whales, they are perpendicular to the water like huge stone pillars. As mammals, whales rely on their lungs to breathe, and when they sleep, they have some of the same breath-holding behavior as humans, with strong muscles around their nostrils that close tightly in the water. Whales have a huge lung capacity and can go underwater for tens of minutes without breathing, and these hours are used by them to sleep.

This characteristic directly determines that the whales will not sleep for as long as humans, but dozens of minutes of rest are enough for whales.

Dolphins, on the other hand, were more interesting when they slept, and most of them were found to have typical USWS sleep behavior, which is alternating between the left and right hemispheres of the brain. In fact, dolphins breathe in much the same way as humans, they can breathe meaninglessly, or consciously hold their breath, the reason why dolphins sleep with half of their brains working, just to surface to expose their nostrils to air, so generally speaking, dolphins' brains will not be completely asleep, and they will not suffocate because they forget to breathe.

All in all, human sleep research on whales, dolphins, and many other animals is still very preliminary, and in addition to the difficulty of observing in the wild, the greater difficulty is that the brainwave analysis that we most commonly use to study sleep is difficult to apply to wild animals. Perhaps in the near future, a more convenient method of research will emerge that will allow us to conduct more in-depth research on wild animals with less disturbance to their lives.

At that time, we may find all kinds of strange ways to sleep, after all, the sea is big, and there are all kinds of creatures.

First of all, you need to know that those are mammals in the ocean, and they all have ventilation structures.

The whale's breathing port grows on the top of its head, and when it wants to exhale, it floats to the surface of the water, and the gas that spews out drives the water, and it sprays into the sky, and then inhales, fills its lungs, and then sinks to the bottom of the water for a few hours and then comes up to breathe.

His lungs are also afraid of water.

Whales, come.

Dolphins and seals live in the water, but they often go to the surface of the water to breathe, and they use their lungs to breathe

They are all raised on the mother's milk, so they belong to the mammals. Sea turtles are typical reptiles that can live on land or in the sea, and although they can live in water, they are not fish and do not have the characteristics of fish.

Viviparous mammals, breathe with lungs...

Because the difference between fish and mammals is not that they live in water, but because the body structure and degree of evolution of fish are different from those of mammals.

Animals such as whales, dolphins, turtles, seals, etc., breathe with their lungs, and fish breathe with their gills.

But animals such as whales, dolphins, turtles, and seals all have the same streamlined appearance as fish.

Viviparous. As mammals, dolphins live in the sea, and their hatchlings are born with their tails first. Females usually have to be pregnant for 11 months before giving birth to calves.

Newborn dolphins feed mainly on their mother's milk, so they follow their mothers closely from birth until they are about three years old, when they learn fishing and other survival skills, and then gradually move away from their mothers and live with their friends.

Dolphins are mammals that live in the ocean.

The body is about two meters long and spindle-shaped. The nostrils are long on the top of the head, the back is bluish-black, with dorsal fins, the abdomen is white, and the forelimbs become fins. The sulci gyrus is complex, can learn many complex movements, and has a good memory. Meat can be eaten, and oil and skin can be used as industrial raw materials.

Dolphins are aquatic mammals and are mostly counted as small cetaceans, so they are viviparous.

Dolphins are a group of aquatic mammals, mostly small toothed whales, which live widely in the world's oceans, and are also found in brackish and fresh water near inland seas and river estuaries, and occasionally in inland rivers. Usually like to live in groups, preying on fish, shrimp, squid, etc.

Dolphins belong to the delphinidae family, and pilot whales, killer whales, and black cetaceans also belong to this family, which are essentially large dolphins. The dolphin family evolved from the late Oligocene more than 20 million years ago, and there are about 17 genera and 37 species, which is the largest family of cetaceans.