animals with shells

List Of Animals With Shells (With Pictures)

From land-dwelling tortoises to sea-dwelling mollusks, animals with shells are some of the fascinating creatures in the animal kingdom. 

Whether you’re an adult with a lifelong fascination with animals or just now beginning to explore the incredible variety of life on earth, learning about animals with shells can open up a whole new world of discovery. 

Read Also: 10 Sea Animals With Shells (With Pictures)

Something is captivating about these creatures, from the diverse shapes and sizes of shells to the unique behaviors of these animals. Join us as we explore the magical world of animals with these traits!

What is a shell?

A shell is an external covering of several layers of special material. It is found in the majority of animals.

The most common type of shell is the exoskeleton. The exoskeleton is a hard, rigid material covering the entire body.

Some shells are conical, while others are spherical. Shells also come in different colors, patterns, and textures. 

Read Also: 10 Animals With Hooves (Photos & Hoof Types)

What is the function of shells in animals?

Animals are amazing creatures with unique characteristics that make them stand out.

They are an important part of many animals’ lives, and their functions are varied. Shells are used for various purposes; let’s take a closer look.

1. Camouflage: Many shells have evolved to match the colors of their habitat, making it difficult for predators to spot them. 

This form of camouflage is particularly helpful for animals that live in areas with a lot of vegetation, like sea turtles.

2. Protection: Shells provide animals with a form of armor against predators and other threats. They provide a hard layer of protection that can make it difficult for predators to bite or harm the animal underneath. 

Some animals, like turtles, also have retractable heads and limbs that can be pulled back into their shell for extra protection.

3. Protection from inclement weather: A shell help an animal as protection against inclement weather and extreme temperatures. 

The hard outer shell acts like a barrier, keeping the animal warm in cold climates and cool in hot climates.

4. Attraction: Shells can also be used to attract a mate. Many animals use the shape and color of their shells to entice potential mates. 

The shells of some animals, such as hermit crabs and mollusks, can be brightly colored and patterned, making them attractive to potential partners.

Read Also: 3 Real Animals With No Neck

In what era did animals with shells first appear?

The first animals with shells to appear on earth were over 500 million years ago. These animals, called Cloudina, had a hard exoskeleton made of calcium carbonate that acted as a protective shell. 

This was the first hard shell to ever appear in the fossil record and is believed to be one of the earliest adaptations of life on earth. 

The development of a shell allowed these animals to survive much better than their predecessors and thrive in their environment. 

Not only did this evolutionary advancement help this species, but it also paved the way for other animals with shells to emerge over time.

Examples of animals with shells

We have already defined a shell in this article’s section. Here is a look at some of the most popular animals that have shells and what makes them so special:

1. Turtles and Tortoises

animals with shells

Turtles and tortoises are both reptiles with a shell; however, turtles and tortoises differ in many ways. A turtle lives in the water, while a tortoise lives on land.

The hard shell that turtles and tortoises possess is an exoskeleton—it’s not part of their bodies or organs but provides protection from predators. 

Some common features include ridges or grooves along its sides. The color can also vary; some species have brightly colored shells, while others are more muted. 

Despite their different appearances and habits, these creatures share one common feature – they possess shells that protect them from predators and shelter them.

2. Armadillo


Nine-banded armadillo Armadillos are beloved animals, admired for their armored shells, unique behavior, and entertaining antics. 

They often explore their environment with their snouts and can be quite fearless when it comes to new experiences.

They are found in South America and parts of the United States; these small mammals have been delighting animal lovers for centuries.

Armadillos are in the order Cingulata and belong to the family Dasypodidae. They range in size from the pink fairy armadillo, the smallest species at just 4 inches in length, to the giant armadillo, which can grow up to 5 feet long! 

Their distinctive hard shells provide them with protection from predators, as well as from the elements.

Armadillos are unique because they can remain in a curled-up position for extended periods. 

This enables them to shelter themselves from the sun during hot days and from cold temperatures during the night. 

They can also roll themselves into a tight ball when threatened, providing even more protection from predators.

Read Also: 11 Examples of Animals With Tusks (Pictures And Overviews)

Armadillos are mostly nocturnal animals, preferring to forage for food in the dark. Their diet consists mainly of insects, but they also eat small mammals, reptiles, eggs, and even fruits and vegetables. They have a keen sense of smell, which they use to locate food.

These small mammals are an important part of the greater ecosystem, as they are responsible for controlling populations of insects, which in turn helps control the spread of disease. 

Armadillos can live up to 15 years in the wild and up to 20 years in captivity. Respect for this species is growing as more people recognize their remarkable adaptations and contributions to their environment.

3. Crustaceans

Crustaceans, crabs

Crustaceans are an incredibly diverse group of animals that are found in oceans, lakes, and rivers all around the world.

They have external shells composed of several plates or segments.


Crabs are covered in a hard outer shell that protects them from predators and allows them to keep their internal organs safe from the elements. 

This shell comprises two parts, the carapace and the abdomen, and it’s held together by a thin membrane. 

This protective covering makes them well-adapted to live in the ocean, where they can often be seen scuttling across the seafloor. Examples of these species include king crabs.


Lobster is a delicious seafood delicacy enjoyed around the world. It’s a rich source of protein, vitamins and minerals, making it a nutritious and tasty meal.

Its unique flavor and texture make it a favorite among seafood lovers. Whether boiled, steamed, grilled or baked, lobster satisfies any craving. One common type of these creatures is the reef Lobsters.

Lobsters can be found in warm and cold water habitats and often grow quite large. Lobsters are also heavily hunted in some areas due to their high value as a food source. 


Shrimp is a small aquatic crustacean with a long body and 10 legs. It is a popular seafood item due to its mild, sweet flavor and its versatility in cooking.

Shrimp are also popular for their use in the aquarium trade. They are often kept as part of a larger aquarium setup, and some species can even be kept as pets.

Shrimps are scavengers, and they eat a variety of food sources, including plant matter, algae, and small fish. They are usually found in shallow waters.

4. Mollusks

Animals with shells, animals that have shells

Mollusks are a diverse group of shelled animals that include snails, clams, mussels, scallops, oysters, chitons, and nautiluses. 

The shells of mollusks cover their soft bodies as they move around the ocean floor.


They are probably the most familiar type of mollusk. They are characterized by a single spiral shell and two pairs of tentacles. 

The most common type of snail is the Roman snail, which has two pairs of tentacles. These snails can be found in fresh and saltwater habitats and feed on plants, algae, and tree sap.


Clams are bivalve mollusks with two hinged shells with a muscular foot for movement. They are mainly filter feeders, but some species are predatory. 

Clams can be found in most marine habitats, and some species are found in freshwater habitats.


Mussel is a type of edible bivalve mollusk that is found in both freshwater and marine environments. It is usually a small organism, measuring around 2-10 inches in length and with a thin, round or oval shell.

Mussels are an important food source for many marine species and play an important role in the marine ecosystem.


Scallops are also bivalve mollusks with two hinged shells but have distinctive fan-shaped shells. They are found in relatively shallow waters, and they are mainly filter feeders. 

Scallops are an important food source for many marine organisms and are also used as bait by fishermen.


Oysters are bivalve mollusks with rocky shells. They are mainly found in marine habitats and feed on plankton and other small organisms. 

Oysters are also a source of food for many animals, including humans. They are delicious and nutritious seafood containing protein, vitamins and minerals. 

Oysters are interesting, complex creatures that are a vital part of our environment and deserve respect and protection.


Chitons are mollusks that have eight plates of armor-like plates that are fused. They are mainly found in coastal habitats. Chitons are mainly scavengers, but some species are predators.

They also have a foot that helps them to cling to rocks. Chitons are herbivores and feed on algae growing on rocks.


Nautiluses are cephalopod mollusks with two layers of shells. They are mainly found in tropical and subtropical oceans and feed on crustaceans, carrion, and other small animals. 

Nautiluses are a wonderful sight to behold and beloved animals among animal lovers.

These animals have adapted to different habitats and lifestyles and play an important role in the marine food web. Animal lovers will be sure to enjoy learning more about these amazing creatures.

Final Thoughts

In conclusion, animals that have shells serve as an important part of the animal kingdom. They provide habitat and protection to many species and fascinating insight into the natural world. 

We can also appreciate their beauty, diversity and the fascinating adaptations they have developed over the centuries.

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