What Animal can’t hear at all?

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Hearing is a vital sense for animals, allowing them to communicate with each other, navigate their surroundings, and detect danger. However, not all animals possess this ability to hear. In fact, there is one group of animals that cannot hear at all. In this blog post, we will explore this fascinating topic in detail and shed light on the animal that is completely deaf.

What Animal can't hear at all?

The Animal that Cannot Hear at All: The Tardigrade

The tardigrade, also known as the water bear, is a microscopic animal that lives in aquatic environments all over the world. These tiny creatures are known for their incredible resilience and ability to survive extreme conditions, such as extreme temperatures, radiation, and dehydration. Despite their many impressive features, one thing that sets tardigrades apart from all other animals is their complete lack of hearing.

The Anatomy of the Tardigrade Ear

To understand why tardigrades cannot hear, we must first take a closer look at their anatomy. While most animals have specialized structures in their ears that allow them to hear, tardigrades do not have these structures at all. In fact, tardigrades lack many of the features that are typically associated with hearing, such as a tympanic membrane, hair cells, and an auditory nerve.

Instead, tardigrades have a simple sensory system that allows them to detect changes in their environment. This system consists of sensory cells that are scattered throughout the animal’s body. These cells are sensitive to touch, temperature, and chemical cues, allowing the tardigrade to navigate its surroundings and detect potential threats. However, they are not capable of detecting sound waves or vibrations, which means that the tardigrade is completely deaf.

The Evolutionary Advantages of Being Deaf

While it may seem like a disadvantage for an animal to be unable to hear, there are actually some evolutionary advantages to being deaf. For example, being deaf allows the tardigrade to conserve energy that would otherwise be spent on maintaining the complex structures required for hearing. This energy can instead be used for other important functions, such as reproduction, growth, and survival.

In addition, being deaf may actually be beneficial for the tardigrade in certain environments. For example, in a noisy environment, such as a fast-moving stream, being able to hear may be a hindrance rather than a help. By being deaf, the tardigrade is not distracted by the sounds of rushing water or other background noise, allowing it to focus on finding food and avoiding predators.

Communication Among Tardigrades

While tardigrades cannot hear, they still have the ability to communicate with each other. This communication occurs through a variety of chemical and tactile cues. For example, when two tardigrades come into contact with each other, they may exchange chemical signals that allow them to recognize each other’s presence and determine whether the other animal is a potential mate or a competitor for resources.

Tardigrades may also use tactile cues, such as physical contact or vibration, to communicate with each other. For example, when a tardigrade is threatened by a predator, it may use its spiny legs to produce vibrations that can be felt by nearby tardigrades. These vibrations can alert other tardigrades to the presence of danger and prompt them to take evasive action.

The Future of Tardigrade Research

Despite their small size and relative obscurity, tardigrades have captured the imagination of scientists and laypeople alike. Researchers are interested in tardigrades for a variety of reasons, including their ability to survive extreme conditions and their unique sensory system. As technology advances, scientists are developing new methods for studying these tiny animals in greater detail.

One promising area of research involves the use of genetic engineering to modify tardigrades. By manipulating the tardigrade’s genes, scientists may be able to create new strains of these animals that are more resilient to extreme conditions or have other desirable traits. This research could have important implications for a variety of fields, including biotechnology, medicine, and conservation biology.


In conclusion, the tardigrade is a remarkable animal that possesses a number of unique adaptations, including its complete lack of hearing. Despite being deaf, tardigrades are able to navigate their environments, communicate with each other, and survive in some of the harshest conditions on Earth. As our understanding of these fascinating creatures continues to grow, we may discover new applications for tardigrade research in a variety of fields.

What Animal can’t hear at all?
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