List of Sea Animals That Don’t Have a Brain – As most of us know that animals also have a brain for them to think. But in fact, not all animals have brains. There are many types of marine animals in the world, even exploration and studies of marine animals are still often carried out today.
One of the unique characteristics of these marine animals is the absence of brains in their bodies. Even though they don’t have brains, they can survive and exist until now. So, what marine animals do not have these brains? Come on, take a look!
Even though they look like plants or rocks, corals or corals are actually animals. Reported by AnimalWised, coral is one of the animals without a brain, heart, and nervous system. However, they are composed of millions of tiny polyps. Well, this coral polyp is an animal. Reported by the Coral Reef Alliance and the National Ocean Service, polyps can live individually or in large colonies that can form reef structures. They have a mutually beneficial relationship with very small algae, the zooxanthellae.
Corals provide the algae with shelter and the nutrients they need. Then the algae will photosynthesize and produce energy. The energy produced will be used by the coral. Then, the waste from the coral will be eaten again by the algae. In addition, corals can also hunt for food. They catch plankton, small fish, or other small organisms using their tentacles to eat.
Based on information from the National Ocean Service and AnimalWised, sponges are one of the oldest animals in the world, some of their fossils even indicate that these animals lived in the Precambrian period or about 4.6 billion years ago. Although often found in the sea, some species of sponges can live in fresh water and river mouths.
Sponges are very simple creatures. Let alone a brain, sponges don’t even have tissue. Even so, sponges are able to adapt well to their habitat so they can live on the surface of rocks, sand, mud, and even underwater ruins.
Sponges feed by pumping water into their bodies and trapping food and oxygen. Bacteria and dirt will be removed from the sponge and this dirt can be consumed by other organisms.
3. Sea lilies
Sea lilies are one of the oldest animals that still exist today. Based on information from Britannica, sea lily fossils show that they lived during the Paleozoic era or about 542 million to 251 million years ago and about 5 thousand species have become extinct.
Just like coral, sea lilies look like plants. How not, they have stems that stick out like plants, not to mention the various and beautiful colors attract attention. Sea lilies usually live in deep water and settle on the seabed. Even so, reported by A-Z Animals, they can actually float in the ocean to find a new place to live if there is no more food in their original place.
In these deep waters, sea lilies eat detritus, the remains of dead bodies or animal waste, with a small mouth in the middle of their bodies. Even though they don’t have brains, they do have a special neural network that allows them to perceive their surroundings according to AnimalWised.
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4. Sea squirt
Sea squirt is another marine animal that does not have a brain. Based on Britannica’s information, these animals live attached to rocks, clam shells or the backs of large crabs, to pier poles and ship hulls. Sea squirts are classified as animals that spend their entire life in only one place, not moving.
Reported by Science World, sea squirt larvae actually have a brain, spine, and eyes. These larvae will swim in the ocean looking for a place to live on the seabed. Then, these animals will absorb the spine, eyes, then eat their own brain so that they will spend their life without these organs.