A sea star resting quietly in a tide pool may not look like one of the ocean’s strangest animals.
It has no recognizable face, no obvious head, and no fins. It may appear to spend most of its life barely moving across a rock. Yet beneath that simple star-shaped body is an animal with hydraulic tube feet, remarkable regenerative abilities, an unusual decentralized nervous system, and—in many species—a stomach capable of extending outside the body to digest prey.
Even the familiar name starfish is misleading. These animals aren’t fish at all. Scientists and aquariums generally prefer the term sea star, although both names remain widely used.
There are roughly 2,000 known species of sea stars, living everywhere from rocky tide pools to deep ocean habitats thousands of meters below the surface. Some have the familiar five arms, while others have dozens. Some move surprisingly quickly, some prey on shellfish, and some play such important ecological roles that removing them can alter an entire coastal ecosystem.
Here are 10 amazing starfish facts that reveal just how extraordinary these familiar ocean animals really are.
⭐ Starfish Quick Facts
| Starfish Fact | Details |
|---|---|
| Preferred common name | Sea star |
| Animal group | Echinoderms |
| Scientific class | Asteroidea |
| Known species | About 2,000 |
| Habitat | Saltwater only |
| Typical arms | 5, but some species have many more |
| Movement | Hydraulic tube feet |
| Diet | Varies; many eat mussels, clams and other animals |
| Nervous system | Nerve ring and radial nerves; no centralized brain |
| Eyes | Simple eyespots at arm tips in many species |
| Regeneration | Many can regrow damaged or lost arms |
| Reproduction | Sexual reproduction; some can also reproduce asexually |
| Closest relatives | Sea urchins, sand dollars, sea cucumbers & brittle stars |
🐟 1. Starfish Aren’t Fish at All
The first starfish fact is also the reason you’ll increasingly hear marine biologists call them sea stars.
Sea stars aren’t fish.
They don’t have the defining features we associate with fish, such as fins, scales, or the same type of gills. They are invertebrates belonging to the phylum Echinodermata, a group whose name comes from Greek words referring to spiny skin.
Their relatives include some equally strange-looking ocean animals:
- Sea urchins
- Sand dollars
- Brittle stars
- Sea cucumbers
- Sea lilies
At first glance, a sea cucumber and a starfish might not seem remotely related. Their shared anatomy becomes clearer when scientists examine their internal structure, development, water vascular systems, and evolutionary history.
All sea stars are members of the class Asteroidea.
And unlike fish, which can include freshwater species, sea stars live exclusively in saltwater.
You won’t find a true sea star naturally living in a freshwater lake, stream, or river.
🌎 2. There Are About 2,000 Species of Sea Stars
The orange or purple five-armed sea star you might encounter in a North American tide pool represents only a tiny part of the group.
Scientists recognize roughly 2,000 living sea star species.
They inhabit oceans around the world, from warm tropical reefs to freezing Antarctic waters. Although tide pools provide some of our easiest opportunities to observe them, sea stars are certainly not limited to shallow shorelines.
Echinoderms have been found at depths exceeding 5,000 meters, or more than three miles below the ocean surface.
Sea stars can occupy habitats including:
- Rocky shores
- Tide pools
- Coral reefs
- Kelp forests
- Seagrass areas
- Muddy bottoms
- Sandy seafloors
- Deep-sea environments
- Polar waters
Their diversity is also reflected in their appearance. Different species may be orange, purple, blue, red, yellow, brown, pink, patterned, or almost camouflage-colored.
Some are broad and chunky.
Others have long, slender arms.
And despite the name, they don’t all look like the classic five-pointed star you drew as a child.
🖐️ 3. Not All Starfish Have Five Arms
Five arms may be the classic sea-star body plan, but it isn’t a universal rule.
Sea stars and other echinoderms are associated with radial symmetry, particularly a five-part or pentaradial arrangement. In the familiar five-armed species, the arms radiate from a central disc like spokes around a wheel.
Some species, however, naturally develop considerably more arms.
Sea stars with:
- 6 arms
- 7 arms
- 10 arms
- 20 arms
- 40 or more arms
all exist.
Some species can have around 50 arms.
One of the most spectacular examples is the sunflower sea star (Pycnopodia helianthoides), a large Pacific predator that can develop more than 20 arms as an adult.
That doesn’t mean finding a six-armed individual of an ordinarily five-armed species automatically means you’ve discovered a new species. Injury, regeneration, developmental variation, and unusual growth can sometimes produce irregular shapes.
The classic star is common.
Nature simply doesn’t feel obligated to stop at five.
💧 4. Hundreds—or Thousands—of Tiny Tube Feet Help Them Move
Turn a sea star over—or, better yet, observe its underside without disturbing it—and you’ll discover rows of tiny flexible structures running along its arms.
These are tube feet.
They form part of one of the most distinctive features of echinoderm anatomy: the water vascular system.
Instead of moving with legs powered like ours, sea stars use a hydraulic system involving seawater-filled canals inside the body. Pressure within this system helps extend and control the tube feet.
Individual tube feet are tiny.
Working together, they can accomplish an impressive range of jobs.
Sea stars use them to:
- Crawl across rocks
- Grip surfaces
- Manipulate prey
- Hold onto shellfish
- Respond to their surroundings
The tube feet don’t function simply as miniature suction cups. Research into echinoderm movement has shown that adhesive secretions help the feet temporarily attach to a surface, while other secretions assist with releasing that attachment.
The result can look like effortless gliding.
🏃 Some Sea Stars Are Surprisingly Fast
Most sea stars aren’t going to win an animal footrace.
But some are much quicker than their slow-motion reputation suggests.
The sunflower sea star is one of the most dramatic examples. A large individual can possess thousands of tube feet—NOAA notes that adults may use approximately 15,000 of them—and can travel at around one meter per minute.
That sounds slow until you remember what we’re talking about.
This is an animal with no legs and no conventional skeleton racing across the seafloor using thousands of tiny hydraulically operated feet.
For prey such as a crab, that suddenly becomes much more impressive.
🍽️ 5. Some Starfish Push Their Stomachs Outside Their Bodies to Eat
This may be the fact that changes the way you look at sea stars forever.
Many species can effectively turn part of their stomach inside out.
The sea star’s mouth is located on the underside of its central disc.
When species that prey on bivalves encounter something like a mussel, they use their arms and tube feet to grip the two halves of the shell. The sea star does not necessarily need to wrench the shell completely open.
A small gap can be enough.
The sea star then pushes its cardiac stomach out through its mouth and into or over the prey.
Digestive enzymes begin breaking down the animal’s soft tissue outside the sea star’s body.
Once the meal has been partially digested, the stomach and liquefied nutrients can be drawn back inside, where further digestion occurs.
It’s difficult to think of a stranger dinner strategy.
🦪 What Do Starfish Eat?
Diet varies greatly between species.
Many well-known sea stars are predators or scavengers that consume animals such as:
- Mussels
- Clams
- Oysters
- Snails
- Barnacles
- Chitons
- Worms
- Crustaceans
- Other echinoderms
Some species consume algae, organic debris, plankton, or other available foods.
The crown-of-thorns sea star, for example, feeds on living coral polyps. Large outbreaks can cause extensive damage to coral reefs when crown-of-thorns populations become unusually abundant.
At the opposite extreme, powerful predatory sea stars can help keep populations of mussels, sea urchins, and other animals under control.
So describing all sea stars as harmless little tide-pool scavengers misses a huge part of their ecological role.
Some are serious predators.
They just happen to hunt very slowly.
💪 6. Starfish Can Regrow Lost Arms—but There’s a Catch
Sea-star regeneration is real.
If a sea star loses an arm to a predator, injury, or another disturbance, many species can gradually regenerate the missing structure.
The process isn’t instantaneous.
Regrowing an arm may take months or longer, and partially regenerated arms can often be seen in wild animals.
During regeneration, cells around the wound undergo extraordinary changes. Specialized cells can lose some of their original characteristics, participate in rebuilding tissue, and eventually form new structures.
That biological flexibility is one reason regeneration in echinoderms fascinates scientists.
But the familiar claim that “any starfish arm can grow into an entirely new starfish” is misleading.
🧬 Can One Starfish Arm Become a Whole New Starfish?
Sometimes—but it depends on the species.
In many sea stars, a detached arm cannot simply produce an entirely new animal. Enough of the central body or appropriate regenerative tissue must remain.
Certain species are dramatically better at whole-body regeneration than others.
Some can reproduce asexually by splitting portions of their bodies and regenerating the missing parts. Certain so-called comet stars can even regenerate an entire body from an arm under appropriate circumstances.
So the accurate version of the famous fact is:
Many sea stars can regrow lost arms, and some species can regenerate enough of the body to produce another individual.
That’s remarkable enough without exaggerating it.
🧠 7. Starfish Don’t Have a Brain Like Ours—but They Do Have a Nervous System
You’ll sometimes hear that starfish “have no brain.”
That’s broadly true if by brain we mean a single centralized organ like the vertebrate brain.
But saying sea stars have no nervous system would be completely wrong.
Sea stars possess a nerve ring surrounding the central region of the body, with radial nerves extending into the arms.
This decentralized arrangement fits their unusual body plan remarkably well.
A sea star doesn’t have a head.
There isn’t one obvious “front” of the animal.
Instead, its arms radiate outward from the center, and different portions of the body can respond to environmental information.
The nervous system coordinates behaviors such as:
- Movement
- Feeding
- Orientation
- Responses to touch
- Reactions to light
- Responses to chemicals in the water
So while a sea star may not have a brain in the familiar sense, it is certainly not an unresponsive object lying on the ocean floor.
👁️ Many Starfish Have an Eye at the End of Each Arm
Look closely enough at the tip of a sea star’s arm and you may find something surprising:
an eyespot.
Many species have simple visual organs at their arm tips.
These aren’t miniature human eyes, and sea stars don’t see the world with anything approaching human visual detail.
But the eyespots can detect light and help the animal orient itself in its environment.
That arrangement becomes especially interesting when a sea star has many arms.
A many-armed species may effectively have visual information arriving from points distributed around much of its body.
This fits the sea star’s radial design much better than having two forward-facing eyes would.
It doesn’t have a face because it doesn’t really need one.
🔄 8. Baby Starfish Don’t Look Much Like Starfish
Sea-star reproduction contains another surprise.
Many species reproduce by broadcast spawning.
Adults release eggs and sperm into the surrounding seawater. When fertilization occurs, the resulting embryos develop into tiny free-swimming larvae.
Those larvae may drift in the plankton and feed before eventually undergoing metamorphosis and settling onto the seafloor.
And here’s the especially interesting part:
Sea-star larvae are bilaterally symmetrical.
In other words, their young body form has a left and right side more like many other animals.
During development, they undergo a remarkable transformation and eventually acquire the radial body organization associated with adult echinoderms.
A microscopic drifting sea-star larva doesn’t look like a tiny five-pointed star.
It has to become one.
🥚 Some Starfish Are Very Different Parents
Not every sea star sends its young drifting into the plankton.
Some species brood their offspring.
Instead of simply releasing eggs and leaving development to the open ocean, brooding sea stars may protect developing young on or within their bodies.
This strategy is especially notable in cold environments.
Smithsonian researchers note that a substantial proportion of known Antarctic sea stars brood their young.
Depending on the species, eggs or juveniles may be kept:
- Near the mouth
- Beneath the body
- Among specialized structures
- Inside body cavities
That is an astonishing range of reproductive behavior within animals most people think of as nearly motionless decorations in a tide pool.
🌊 9. Starfish Can Be Keystone Predators That Reshape Entire Ecosystems
One of the most important ecological discoveries involving sea stars changed the way scientists think about ecosystems.
Certain sea stars function as keystone predators.
A keystone species has an ecological impact disproportionately large compared with its abundance.
The classic example involves the ochre sea star, Pisaster ochraceus, on the Pacific coast of North America.
Ochre sea stars prey heavily on mussels.
Without enough predation, mussels can expand across rocky surfaces and crowd out many other organisms competing for the same space.
When sea stars keep dominant mussel populations in check, more room remains for other animals and algae.
That can increase the diversity of the entire intertidal community.
So one sea star eating one mussel may look insignificant.
Multiply that interaction across an ecosystem and the consequences become enormous.
🌿 Sunflower Sea Stars Can Help Protect Kelp Forests
A similar relationship occurs beneath the water.
Sunflower sea stars are major predators of sea urchins.
Sea urchins eat kelp.
When sunflower sea stars declined catastrophically along the Pacific coast, urchin populations increased in some regions. Large numbers of urchins can consume enormous amounts of kelp, contributing to the development of urchin barrens where once-rich kelp forests have been severely reduced.
Kelp forests provide:
- Fish habitat
- Nursery areas
- Food
- Coastal productivity
- Refuge for numerous marine species
That means losing a large predatory sea star can create a chain reaction extending through an entire ecosystem.
A starfish isn’t merely an interesting animal sitting on a rock.
Sometimes it’s helping hold the neighborhood together.
🦠 10. Sea Star Wasting Disease Has Killed Billions of Sea Stars
Sea stars may possess remarkable regenerative abilities, but they are not invincible.
Beginning in 2013, an enormous outbreak known as sea star wasting disease swept through populations along the Pacific coast of North America.
Affected animals can develop symptoms including:
- Lethargy
- Deflated appearance
- Lesions
- Twisted arms
- Tissue deterioration
- Loss of arms
- Body fragmentation
Severely affected sea stars can die within days after obvious symptoms appear.
More than 20 species have been affected.
The sunflower sea star was hit especially hard.
Researchers estimate that billions of sunflower sea stars disappeared, with losses exceeding 90% across much of the species’ range.
🔬 Scientists Have Made an Important Breakthrough
For years, the precise cause of sea star wasting disease remained one of marine biology’s major mysteries.
That story has changed.
Research published in 2025 identified a strain of the bacterium Vibrio pectenicida as a causative agent of wasting disease in sunflower sea stars.
Researchers isolated the bacterium and demonstrated through controlled exposure that it could produce the characteristic disease.
Scientists are still studying the broader disease process, environmental influences, and how causes may vary among species and outbreaks.
The discovery is important because identifying what actually makes animals sick is a major step toward understanding how disease spreads and whether conservation interventions might help.
As of 2026, researchers continue to monitor sea-star populations along the Pacific Coast. There have been encouraging sunflower sea-star observations in some regions, but populations remain far below the densities seen before the catastrophic wasting event.
🌻 What Is a Sunflower Sea Star?
The sunflower sea star deserves special attention because it breaks so many of our assumptions about starfish.
Pycnopodia helianthoides can become enormous, develop more than 20 arms, possess thousands of tube feet, and move surprisingly quickly across the seafloor.
Its range extends through northeastern Pacific waters from Alaska toward Baja California.
It lives in habitats including:
- Kelp forests
- Rocky areas
- Sand
- Mud
- Intertidal zones
- Deeper subtidal environments
As a major predator of sea urchins and other animals, it has an important role in coastal ecosystems.
Its devastating decline is one reason scientists, aquariums, conservation organizations, and government agencies are working to understand both wasting disease and possible population recovery.
🫧 How Do Starfish Breathe?
Sea stars don’t have lungs.
They also don’t have fish-like gills.
Gas exchange occurs primarily through thin structures on the body’s surface, including papulae, sometimes informally called skin gills, and through parts of the tube-foot system.
Oxygen dissolved in seawater diffuses across these thin tissues.
This dependence on surrounding seawater is one reason removing a sea star from the ocean can be stressful.
If you find one while exploring a tide pool, the best approach is generally to look without picking it up.
❤️ Do Starfish Have Blood?
Not in the way humans do.
Sea stars use internal fluid systems that function very differently from the closed circulatory system moving blood around the human body.
Their famous water vascular system plays an important role in movement and internal transport.
Other body fluids circulate nutrients and gases through internal spaces.
So the popular statement that sea stars “pump seawater instead of blood” captures part of their unusual biology, although the full physiology is more complicated than that simple comparison suggests.
The important point is that their internal plumbing is profoundly different from ours.
🦴 Do Starfish Have Bones?
No.
Sea stars don’t have an internal skeleton of bones like vertebrates.
Instead, their body wall contains small calcium-carbonate plates called ossicles.
Together, these form a flexible internal support system.
That’s why a living sea star can feel firm without having anything resembling a human skeleton.
Those plates also connect sea stars to the broader echinoderm family, whose members often contain intricate calcium-carbonate skeletal structures.
🦔 Why Do Some Starfish Feel Spiny?
The name Echinodermata essentially means “spiny skin.”
Depending on the species, a sea star’s upper surface may contain:
- Spines
- Bumps
- Plates
- Small pincers called pedicellariae
- Skin gills
Some species look relatively smooth.
Others appear almost armored.
These structures can provide protection, support, cleaning functions, or other specialized roles.
Never run your fingers aggressively across a sea star to investigate its texture.
Observation is enough.
🎨 Why Are Starfish So Colorful?
Sea stars come in a remarkable range of colors.
Tide-pool species alone may appear:
- Purple
- Orange
- Red
- Pink
- Yellow
- Blue
- Brown
- Gray
Color can serve several possible functions depending on the species and environment, including camouflage, warning, protection from light, or simply being a product of biological pigments without one easily defined purpose.
Even individuals within the same species may show striking color variation.
The famous ochre sea star, despite its name, can commonly be seen in both orange and purple forms.
🦀 What Eats Starfish?
Sea stars may be predators, but they’re also prey.
Depending on location and species, predators can include:
- Crabs
- Lobsters
- Fish
- Seabirds
- Sea otters
- Other sea stars
Being attacked may even help explain why regeneration is so valuable.
If a predator grabs an arm and the sea star escapes after losing it, regeneration can eventually restore the missing structure.
An injured sea star with one tiny arm growing beside several full-sized arms is therefore not necessarily dying.
You may be looking at an animal actively rebuilding itself.
🌊 Where Is the Best Place to See Starfish?
Rocky intertidal zones can offer excellent opportunities during low tide.
As the ocean retreats, pools of seawater remain trapped among the rocks and reveal animals that would normally be underwater.
Depending on your coast, you might encounter:
- Sea stars
- Anemones
- Crabs
- Mussels
- Barnacles
- Sea urchins
- Snails
- Small fish
Some of the best tide-pooling regions are found along rocky coasts where substantial tidal changes expose broad intertidal areas.
Our La Jolla Cove, San Diego: Sea Lions, Snorkeling, Beaches & Things to Do guide includes tide-pool areas along the Southern California coast.
🔎 How to Look for Starfish in Tide Pools
Timing is everything.
Check local tide tables and aim for a low tide, ideally one low enough to expose the lower intertidal zone safely.
Then move slowly.
Look:
- Beneath ledges
- Along vertical rock faces
- Among mussel beds
- Beside kelp
- In deeper tide pools
Sea stars can blend surprisingly well into their surroundings.
A bright orange individual may be obvious.
A mottled brown species beside algae can disappear until you stop moving and really look.
✋ Should You Pick Up a Starfish?
It’s better not to.
Sea stars are adapted to very specific marine conditions. Handling can damage delicate tube feet and surface structures, while removing an animal from water can cause additional stress.
There may also be local laws prohibiting collecting or disturbing intertidal wildlife.
The best tide-pool rule is:
Observe animals where they live.
If you move a rock to look underneath, gently return it to exactly the position in which you found it.
Don’t collect sea stars.
Don’t peel them from rocks.
And don’t arrange them for photographs.
A natural photograph of a sea star behaving normally is considerably more interesting anyway.
For more responsible shoreline exploration tips, see our Become a Beach Comber: Your Gateway to Coastal Treasures and Hidden Discoveries.
🌡️ Tide Pools Are Tough Places to Live
A tide pool looks peaceful during a calm low tide.
For its inhabitants, it can be an extreme environment.
As the tide falls, organisms may suddenly experience changes in:
- Water temperature
- Salinity
- Oxygen
- Sun exposure
- Wave action
- Predator access
Hours later, incoming tide floods the same area with cooler seawater and crashing waves.
Sea stars living in the intertidal zone have evolved to tolerate remarkable environmental swings.
Their powerful attachment abilities help them remain on rocks when surf returns.
But even hardy intertidal animals can be stressed or injured by human handling.
🌍 Starfish Live in Every Ocean
Sea stars occur throughout the world’s oceans.
They live in tropical, temperate, and polar environments and have even been recorded in extraordinarily deep water.
This is another reason the word “starfish” can create the wrong image.
They’re not exclusively colorful tropical creatures.
Some of the world’s most remarkable sea stars live in:
- Antarctic waters
- Deep-sea darkness
- Cold Pacific kelp forests
- Rocky North Atlantic shores
Wherever there’s saltwater, the broader echinoderm family has found impressive ways to survive.
❓ Starfish FAQs
Are Starfish Fish?
No. Starfish are echinoderms, not fish. Sea star is the more biologically accurate common name.
How Many Species of Starfish Are There?
There are roughly 2,000 known species of sea stars.
Do Starfish Live in Freshwater?
No. Sea stars are marine animals and live in saltwater.
Do All Starfish Have Five Arms?
No. Five is common, but species with many more arms exist. Some sea stars can have dozens.
Can Starfish Regrow Their Arms?
Yes. Many species can regenerate lost or damaged arms, although the process may take months or longer.
Can a Starfish Grow From One Arm?
Some species can regenerate an entire body from a sufficiently complete portion of the animal, but this isn’t true of every sea star. The idea that any detached arm automatically becomes a new starfish is a myth.
Do Starfish Have Brains?
Sea stars don’t have a centralized brain like vertebrates. They have a nerve ring and radial nerves extending into the arms.
Do Starfish Have Eyes?
Many sea stars possess simple eyespots at the tips of their arms that can detect light and help them navigate.
Do Starfish Have Blood?
They don’t have blood and a circulatory system like humans. Their internal transport and movement systems use seawater and other body fluids in ways very different from vertebrate circulation.
How Do Starfish Walk?
They use rows of tiny tube feet controlled through a hydraulic water vascular system.
How Fast Can a Starfish Move?
Most move slowly, but sunflower sea stars can reach approximately one meter per minute.
What Do Starfish Eat?
Diet varies by species. Many eat mussels, clams, snails, barnacles, and other invertebrates. Others consume different marine organisms or organic material.
Do Starfish Really Eat With Their Stomach Outside Their Body?
Some do. Many predatory sea stars can extend their cardiac stomach through the mouth and digest prey externally before drawing the stomach back inside.
Where Is a Starfish’s Mouth?
The mouth is located on the underside of the central disc.
How Do Starfish Breathe?
Gas exchange occurs across thin body structures, including papulae and parts of the tube feet.
Do Starfish Have Bones?
No. Their body wall contains calcium-carbonate plates called ossicles rather than vertebrate bones.
How Do Starfish Reproduce?
Many species release eggs and sperm into seawater. The fertilized eggs develop into larvae before metamorphosing into juvenile sea stars. Some species brood young, while others can reproduce asexually.
Are Baby Starfish Shaped Like Stars?
Not initially. Many begin life as tiny swimming larvae with bilateral symmetry and acquire the familiar radial body form during metamorphosis.
Are Starfish Dangerous to Humans?
Most sea stars encountered by beachgoers aren’t dangerous when simply observed. Some species possess defensive structures or compounds, so wildlife should always be left alone.
Can You Touch a Starfish?
It’s better to observe without touching. Handling can stress the animal, damage tube feet, and may violate local wildlife regulations.
Can You Take a Starfish Home From the Beach?
Don’t collect living sea stars. Collection of intertidal wildlife is also prohibited in many protected areas.
What Is Sea Star Wasting Disease?
Sea star wasting disease is a severe condition that causes lesions, tissue deterioration, arm loss, fragmentation, and death in affected sea stars.
What Causes Sea Star Wasting Disease?
Research published in 2025 identified a strain of the bacterium Vibrio pectenicida as a causative agent of wasting disease in sunflower sea stars. Scientists continue investigating the disease across other species and environmental conditions.
Are Sunflower Sea Stars Endangered?
Sunflower sea stars experienced catastrophic declines following the wasting epidemic and remain a major conservation concern. NOAA has proposed listing the species as threatened under the U.S. Endangered Species Act.
🌟 Starfish Are Much Stranger Than They Look
A sea star sitting motionless in a tide pool can seem almost simple.
Five arms.
A rough surface.
No obvious face.
Maybe a beautiful orange or purple color.
But look beneath that familiar outline and almost everything about the animal becomes unusual.
Thousands of tiny tube feet operate through a hydraulic system. A decentralized nervous system coordinates a body with no true head. Simple eyes sit at the ends of the arms. Some species push their stomachs outside their bodies to digest prey. Lost limbs can regenerate. Larvae begin life with a completely different body plan before transforming into the radial adults we recognize.
And those strange anatomical features matter far beyond the individual animal.
Sea stars can control mussel populations, hunt sea urchins, influence kelp forests, and change the balance of entire marine communities. When billions disappeared during the Pacific Coast wasting epidemic, scientists saw just how much an ecosystem could change when an important predator vanished.
So the next time you spot a starfish in a tide pool, resist the temptation to pick it up.
Crouch beside the water instead.
Look for the tiny tube feet beneath its arms. See whether one arm is shorter and still regenerating. Notice the small eyespot near an arm tip if you can see it without disturbing the animal.
What looks like a simple star lying on a rock is actually one of the ocean’s most beautifully unconventional animals.
And the more you learn about sea stars, the stranger—and more impressive—they become.
🔗 Related Articles
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- La Jolla Cove, San Diego: Sea Lions, Snorkeling, Beaches & Things to Do
- Hanauma Bay, Oahu: Snorkeling, Reservations, Marine Life & Visitor Guide
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📚 Sources
- NOAA Ocean Service — Are Starfish Really Fish?
- Smithsonian Ocean — Sea Stars, Urchins and Relatives
- Smithsonian Science Education Center — All About Starfish
- National Park Service — Creature Feature: Sea Stars
- NOAA Ocean Service — What Is a Tide Pool?
- NOAA Fisheries — Sunflower Sea Star
- NOAA Fisheries — Sunflower Sea Star Wasting Syndrome Pandemic
- Multi-Agency Rocky Intertidal Network — Sea Star Wasting Disease
- Multi-Agency Rocky Intertidal Network — Sea Star Wasting Disease Updates
