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Top 13 animals that do not exist in the world

Throughout history, philosophers have believed that the human brain may even contain a soul. At the same time, the brain of animals is also considered a decisive factor for survival, but the following animals do not need a brain and still survive skillfully.

1. Sea ​​urchin

Sea urchins are animals with sharp, spiny heads, and any barefoot beachgoer can spot this in the worst way. Luckily, outside of South Florida, sea urchins are not poisonous. This creature has countless legs and controls its feeding using its water vascular system. That system changes the amount of pressure and water in its body, allowing it to move faster. The creature's mouth is located below it. They expel feces from the top of their bodies. Sea urchins sit on rocks, scratch and eat algae. In many ways, this action keeps the ocean clean.

Sea urchins or sea urchins have the scientific name Echinoidea, belonging to the class of animals with echinoderms, usually living in the sea or clinging to coastal rocks. Sea urchins have a round shape like a ball, their outer layer is covered with black spines like a urchin. As it grows, the sea urchin grows larger and is about the size of a king orange, a little smaller than a grapefruit.
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2. Holothurian

Worm-shaped sea cucumbers eat plankton everywhere. Sea cucumbers are extremely dangerous, but without a brain, they are not necessarily a deliberate threat. They are capable of releasing a toxic substance called holothurin, which can cause permanent blindness. Sea cucumbers feed instinctively, using tubular legs around their mouths to catch and retrieve food. Their diet includes aquatic invertebrates, algae and waste. Curiously, while they lack the facility to even realize it, these marine creatures exhibit asexual and sexual reproduction.
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3. Jellyfish

Jellyfish are species that move with ocean currents. They also spray water which can move them forward. Jellyfish work through a network of sensory nerves. Tentacles react to foreign objects with a sting. That sting secretes a toxin that can neutralize or kill the intruder.


Jellyfish do not have a brain, heart, ears, head, legs or bones. Their skin is so thin that they can breathe through it. Although jellyfish do not have a brain, they do have a primary nervous system with receptors capable of detecting light, vibrations and chemicals in the water. These abilities, along with a sense of gravity, help jellyfish navigate and move in water easily.

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4. Coral

Corals and jellyfish are part of the Cnidarians family. Their bodies are asymmetrical and they both sting their enemies. Classified as plants, coral is actually a living animal without a brain. This is the great difference between plants and animals: animals search for food; self-produced factory. Corals join animals in searching for food. They make up a lot of tiny creatures. These coral polyps gnaw on the plankton that survive in the ocean. Corals capture plankton with their retractable tentacles and then they feed.


A coral "head" is actually made up of thousands of individual polyps with identical genetic makeup, each polyp only a few millimeters in diameter. After thousands of generations, these polyps leave behind a skeleton that is characteristic of their species. Each coral head grows through asexual reproduction of polyps. Corals also reproduce sexually using gametes, which are released simultaneously over a period of one to several consecutive nights during the full moon.

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5. Starfish

Starfish are cousins ​​of sea urchins. But it's not a fish. The truth is that this species cannot swim. Sea stars spend all their time at the bottom of the ocean. While you may find them floating or washed up on shore, that is never an option! At the end of each arm, the creatures have tiny eyes that distinguish between dark and light. Starfish have no effect on the brain. It uses basic sensors to stay alert for enemies and food. Sea stars have from five to 40 spiky arms. If a predator bites off an arm (or two), the animal can regenerate them.


Sea stars play an important role throughout ecology and biology. Sea stars, such as the sea star Pisaster ochraceus have become widely popular as examples of keystone species in ecosystems. The sea star Acanthaster planci is a voracious predator of corals throughout the Indo-Pacific region. Other sea stars, such as members of the Asterinidae, are often used in developmental biology.
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6. Clam

Clams are brainless mollusks and have compressed bodies inside which are a pair of hinged shells. Other members of the family include oysters, mussels, and scallops. Clams can open and close their shells. The clam manages to function thanks to its nervous system. They are popular in the fishing world because clams are easy to catch and live all over the world. Clams have kidneys, stomachs, mouths, nervous systems and beating hearts.


Clams use fascinating methods to obtain and consume their food. Firstly, clams can move a little with the help of their “feet”. They use this cone-shaped muscle to better position themselves in the water to obtain nutrition. They do not attach themselves to the substrate like barnacles; They will find an area with plenty of food and dig enough burrows to stay in while they forage.

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7. Giant clam

The giant clam or giant clam is a soft-bodied species without a brain and has the largest bivalve shell. The giant clam is one of the most endangered clam species. They are one of several large clams native to the shallow coral reefs of the South Pacific and Indian Oceans, and can weigh more than 200 kg (440 lb) and measure 120 cm (47 in) across. and has an average lifespan in the wild of 100 years or more. They are also found off the coast of the Philippines, where they are called taklobo, and in the South China Sea in the reefs of Sabah (East Malaysia).


Giant clams are provided with a huge amount of food by Zooxanthellae algae. Single-celled plants are absorbed by Zooxanthellae algae, then metabolized and added to nutrients for giant clams. That is the reason why they have such a huge size even though they live in seas that are poor in food. These giant clams will also feed back the algae with a nutrient cycle that makes this symbiotic relationship inseparable.
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8. "Portuguese Man-of-War" - Hydra

Do you think that those "sail buoys" with their transparent, inflated shapes are a species of jellyfish? But not! Even scientists share that: It looks a lot like jellyfish but turns out to be tube hydras.


Hydras are brainless species, they have an appearance like fragile sail buoys, floating aimlessly on the surface of the vast ocean. We can see this species of hydra more often from September to December. Hydrants are found in most tropical and subtropical seas, their sail-shaped buoy can float on the water surface. up to 15 cm. Hidden beneath that bulging buoy are thousands of long filaments of tentacles and polyps, which can be up to 50 meters long.
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9. Sponges

Sponges, also known as foraminifera, do not have a nervous system, digestive system, or circulatory system. Instead, most of these rely on maintaining a constant flow through the body to get food and oxygen and remove waste. An interesting fact about sponges is that they can "sneeze" in the water. When any foreign object enters the system, they will immediately take in an additional amount of water and spray it out to remove the foreign organism, similar to a human sneeze. Although sponges do not have brains, they can still perceive their surroundings in a special way.


While most people are probably familiar with the terms “omnivores” and “carnivores,” they do not apply to sponges. Sponges have a filter feeder and allow water to passively flow through them, capturing any food that passes through. Since the majority of this food is bacteria and plankton, it is single-celled in origin. Animals that filter microscopic life and detritus as food are called pests, as it is more specific to their unique niche.

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10. Oysters

Oysters are brainless animals related to clams, famous for the precious pearls in their shells. But it's a treasure hunt because your odds of finding a perfect pearl are about one in a million. Oysters filter water and remove organic particles – like plankton – in order to eat them. They can filter up to 50 gallons of water per day, providing them with enough food to survive for a while.


Oysters are molluscs belonging to the group of bivalve molluscs in the family of clams, oysters, snails, and mussels that live on the coast, on coastal rocks or in estuaries, living attached to a substrate like clinging to a rock. forming boulders, rocky reefs, bridge foundations that eat plankton and other organisms in mud, sand, sea water... Oysters are also considered a type of aquatic seafood. Oyster meat is delicious and sweet, very rich in nutrients, containing protein, glucose, fat, zinc, magnesium, calcium... Oysters play an important role in the ecosystem because they filter impurities from water and are a source of food. products for coastal communities. The majority (75%) of the world's natural oyster species are found in five locations in North America.
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11. Crinoid

Sea lilies, also known as sea lilies, are marine animals that belong to the class Crinoidea of ​​animals. They sit motionless on the ocean floor throughout their lives. There is also research showing that the sea morning glory has the ability to float to a new location when it can no longer find food. If necessary, they can travel at speeds of up to 140 miles per hour.


Sea lilies are related to starfish, sea urchins and sea cucumbers. The animal has a small mouth in the middle of its body and it feeds mainly on animal feces that drift to the ocean floor. So, like some of the other animals on this list, crinoids instinctively do their part to keep the ocean clean. Typically, crinoids can grow up to 30 inches long, although fossils show they grew up to 80 feet.
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12. Anemone

Sea anemones are another brainless animal with a plant-like appearance. However, sea anemones live in abundance and search for food, using their long tentacles to catch and eat. A unique feature of sea anemones is their ability to change shape. This action is performed by retracting and rotating the long muscles in its tentacles. It is an amazing thing how they change shape and form while swaying in the water. It shows how, despite lacking a brain, animals can use sensors to respond to their surroundings.


Sea anemones are a group of aquatic predators belonging to the order Actiniaria. They are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia.[1] Anthozoa often have large polyps that allow digestion of larger prey and also lack a medusa stage. As protozoa, sea anemones are closely related to corals, jellyfish, Ceriantharia and hydras.
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13. Sea squirt

Sea squirt. Sea urchin larvae have a brain, but when they begin to mature and cling to an object, the animal's brain will gradually disappear. Sea urchins also have the ability to self-seal wounds by regenerating new cells. Although they are animals, sea urchins look quite similar to plants.
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