Do Sea Turtles Get Lost?

Did you know some female sea turtles can travel hundreds—or even thousands—of miles through open ocean before returning to nest on or near the very beaches where they hatched? In fact, Leatherback sea turtles take this long-distance travel to an extraordinary level. Pacific leatherbacks nesting in Indonesia have been documented migrating more than 10,000 kilometers to the West Coast of the United States. That’s the longest migration of any air-breathing marine vertebrate. So how do they accomplish this without Google Maps?

Scientists have found that sea turtles can sense magnetic information and use it as a navigational cue. Because the strength and angle of Earth’s magnetic field vary across the planet, these subtle differences can provide turtles with information about where they are and help guide their movements across the ocean. For turtles that return to their birthplace to nest (a behavior known as natal homing), these magnetic cues may be especially important. It’s an extraordinary system, but even the best navigation can take a turtle only so far.

Despite their great sense of direction, sea turtles don’t always make it where they’re going.

A sea turtle may be capable of navigating thousands of miles, but reaching the right destination is that much more of a challenge when human-caused obstacles lie in the way.

Artificial light is one example. Artificial lighting not only discourages nesting females from coming ashore but also has a harmful impact on hatchlings, which historically emerge from their nests at night and orient toward the brightest horizon. On a natural, undeveloped beach, that is generally the open ocean. But artificial light from coastal development can overwhelm the natural cue, drawing hatchlings inland away from the water and causing them to get lost on day one.

Coastal development not only brings more artificial light and human activity to the shoreline, but it also changes turtle habitats themselves. Buildings, roads and other development can alter or reduce areas sea turtles need for nesting. Shoreline armoring, such as seawalls, can eliminate the dry sand turtles need to successfully nest, while beach driving and other activities can further disrupt nesting habitats. And these challenges extend beyond the beach.

The ocean is getting noisier, too. Sea turtles have internal ears and can hear underwater sounds. Vessel traffic, oil and gas surveys, underwater construction and sonar all add noise to the marine environment. Human-generated sound can cause stress, disrupt normal behaviors or even force marine animals to move from preferred habitats or divert from migratory paths.

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Evolution never saw the plastic grocery bag coming.

Then there’s a threat sea turtles encounter almost everywhere they travel: plastic pollution. Sea turtles evolved over millions of years to spot drifting prey, like jellyfish. But plastic rapidly started to be used only around 60+ years ago.

Our plastic trash entered the ocean so quickly that animals haven’t had time to adapt. To a hungry sea turtle, a floating plastic bag still looks enough like dinner to trick even an experienced turtle. Plastic bags, balloons, soft plastic packaging and other plastics, once swallowed, can block a turtle’s digestive tract or puncture internal organs. And it doesn’t necessarily take much.

A recent Ocean Conservancy study of more than 10,000 marine animal autopsies found that nearly half of the sea turtles studied had ingested plastic. Even more alarming, researchers found that for adult loggerhead turtles, swallowing just one and a half times the plastic in a golf ball was enough to kill 50% of these creatures.

It’s a heartbreaking reminder that something we use for minutes can threaten an animal that’s been roaming Earth’s ocean for more than 100 million years.

Ancient animals still face very modern threats.

Sea turtles survived the extinction event that wiped out dinosaurs. They’ve outlasted shifting continents and dramatic changes to our planet. But surviving millions of years doesn’t make them invincible. Today, they’re facing threats that appeared in the blink of an evolutionary eye: plastic pollution, habitat loss, vessel strikes, fishing gear entanglement and climate change. The remarkable thing is that many of these challenges aren’t inevitable. They’re problems we can all help solve.

Together, we can reduce the amount of plastic that reaches the ocean. We can protect and restore nesting beaches. And we can support policies that protect healthy ocean ecosystems. Every action helps make our waters a safer place for animals that depend on it.

So, do sea turtles get lost? When left to their own devices, not often. Sea turtles have an extraordinary ability to navigate across vast stretches of open oceans. But there’s a bigger question worth asking: Can we help make the ocean a safe place while they make these incredible journeys? Navigation is only part of the challenge for sea turtles trying to find their way home. Sea turtles may know where they’re going, but it’s our job to ensure the ocean and coastlines they depend on are safe when they get there. That’s why Ocean Conservancy is committed to protecting our entire ocean—and all the creatures that dwell there.

We’re fortunate to share the planet with these amazing creatures. Their journeys are a remarkable feat of science and survival. To all the turtles out there: Here’s to finding your way—wherever you’re going!

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Lessons from Coastal Legends

Storytelling is one of our oldest human behaviors. Across every culture and continent, people have used stories to share values, pass down knowledge and make sense of the world around them. The tales that survive, retold across generations, kept alive through memory and ceremony, aren’t arbitrary. These coastal legends carry essential wisdom.

For countless coastal communities, that wisdom is related to the ocean.

Here are five coastal stories that are important parts of different oral traditions and teach us about our ocean.

Scotland: Selkie Stories

Early written records from the coast of Scotland describe seal-people who shed their aquatic skins to walk among humans on land.

These are the selkie. Their stories follow a familiar arc. One is discovered on shore, their sealskin is stolen and they are bound to a human life. They marry, raise children, but remain melancholy, always watching the water. When the skin is finally found, they return to the sea without hesitation.

It’s not difficult to see where the concept took root. Gray and harbor seals have strikingly humanesque features like expressive eyes, complex vocalizations, mothers who nurse their pups. Early coastal communities observed those qualities, and the selkie story began to spread. It produced a cultural taboo against the excessive hunting of seals.

Today, the selkie is one of Scotland’s most recognized figures. Conservation organizations have adopted the selkie as a bridge symbol of cultural identity and ocean protection. Gray seal populations in Scottish waters continue to face pressure from abandoned fishing gear and historical culling practices, behaviors the selkie taboo was designed to prevent.

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Pasifika: Wayfinding

Pasifika is a collective term for the Indigenous Peoples of the Pacific Islands. For more than 3,000 years, they’ve managed to pass along extremely complex knowledge on how to navigate the vast expanse of the Pacific Ocean. 

Their secret weapon? Storytelling. 

They shared stories of the demigod Māui and his canoe, Waka-a-Māui, then navigated by their corresponding constellations in the sky. Tāwhirimātea was the god of wind and storms. When his eyes appeared in the sky (as the Pleiades cluster), it meant that it was a good time to start a long voyage. Stories like these gave navigators a framework for planning their journeys and navigating the distances.

Wayfinding is a science. The people of Pasifika developed their knowledge system through thousands of years of empirical observation, experimentation at sea and rigorous knowledge transmission. The names and stories were a medium of storing and sharing this knowledge, and an effective one at that.

Mexico: Chalchiuhtlicue

Chalchiuhtlicue is the Aztec goddess of rivers, lakes, seas and the ocean, as well as the protector of fishermen and navigators. In Aztec cosmology, she was one of the most actively worshiped deities. 

In different stories, she is portrayed as both a creator and destroyer, as surges of water can result in abundant harvests or devastating floods. Today, Mexico’s Pacific and Gulf coasts are among the world’s most biologically rich but storm-exposed marine environments.

Chalchiuhtlicue’s tradition reflects an understanding of how water has the potential to be life-giving or destructive depending on amount and location. Mexico’s Indigenous cultures understood water as the foundational substance of existence, from the ocean to the hydrological routes that fed agricultural soil.

Vietnam: Grandfather Whales

The coastal communities of Vietnam have long shared stories of whales as divine protectors, often referring to them as Cá Ông or “Grandfather Whales.” 

It is believed that when fishing boats are lost in a storm, whales physically rescue the crew by sending them toward shore. Several fishing villages in Vietnam still celebrate the Whale Prayer Festival twice a year. Because the whales are so revered, fishermen report whale encounters. Whales received sacred funerals whenever they are beached.

These coastal villages demonstrate a relationship with whale species marked by reciprocity. Sperm whales, humpbacks and gray whales, in fact, show behaviors that are consistent with the stories about rescue. They may approach distressed swimmers, encircle capsized vessels or even support injured kin. When a whale dies, gratitude and grief are expressed. The practice of providing a proper Confucian funeral to beached whales reflects the way that a whale carcass can still sustain hundreds of species after death.

The outside of a whale temple in Lăng Ngư Ông Nam Ô, Vietnam. Photo Credit: Lyssa Manning

Whale bones inside a whale temple in Lăng Ngư Ông Nam Ô, Vietnam. Photo Credit: Lyssa Manning

Caribbean: Mami Wata

Many cultures in the Caribbean have carried a belief in Mami Wata. She is an ocean deity, often depicted as a mermaid, who goes by several names: La Siréne in Haiti, River Mumma in Jamaica, and Yemonja in Brazil. Her reinterpretation across several cultures maps how her oral tradition was carried across the Atlantic by enslaved Africans and adapted in different Caribbean settings. Mami Wata is depicted as a beautiful woman, skilled at music, who can be both generous and dangerous. This dual nature is parallel to the Caribbean. It is one of the world’s most biodiverse marine environments, supporting coral reef ecosystems of extraordinary productivity, but it is also a region of violent tropical storms, dangerous currents and unpredictable weather.

Sightings of Mami Wata are thought by some scholars to be related to sightings of manatees. The large, slow marine mammals with humanlike eyes and nursing behavior may match the characterizations of the deity. When the belief in Mami Wata began to decline, so did manatee populations. This reflects a phenomenon researchers call the “sacred species” effect. When a creature holds deep spiritual significance in a culture, harming it carries social and moral consequences that can be more powerful than legal ones. This provides an element of protection that is sometimes more effective than law.

Long before satellites tracked ocean temperatures, people who lived alongside the water were paying close attention. They noticed which creatures signaled safe weather and which behaviors led to abundant catches. They encoded those observations into the stories they told—deities, creatures, warnings and rituals that traveled across centuries intact.

These aren’t relics. Many are living traditions, still practiced and still relevant. And when held up alongside what marine science has since confirmed, the parallels are striking. 

The stories contain lessons

What connects a fisherman’s reverence for seals in Scotland to a Vietnamese community’s funeral rites for a beached whale? Around the world, people understand that the ocean is not only a resource for extraction but also offers a relationship to be maintained.

Ocean Conservancy operates on the same understanding. This drives our work today, from protecting marine ecosystems and rebuilding fish populations to fighting the pollution and policy decisions that put our ocean at risk. Right now, aging offshore oil and gas infrastructure is corroding on the seafloor, threatening many of the species that cultures around the world hold dear. The companies that build this infrastructure exploit loopholes to avoid cleaning it up. But we can change that. The proposed Offshore Leasing Standards and Accountability Act before Congress now would require oil and gas companies to take responsibility for their operations before, during and after they drill.

The ocean has always been worth protecting. Add your name and help us pass the Offshore Leasing Standards and Accountability Act now.

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What are Tire Wear Particles?

What do you think about when you hear the words “microplastic pollution?” Your mind may immediately go to imagery of colorful fragmented plastics broken off from bottles, buckets and other items we use in our everyday lives. Or, perhaps, you imagine a pile of microplastic fibers—the tiny, squiggly, spaghetti-shaped plastics that shed from our synthetic clothing. You may be surprised to hear there is another major source of microplastic pollution that’s hiding in plain sight, quite literally under our feet, that might change how you think about microplastics: tire particles.

We all know tires wear down over time—that’s why we have to replace them on our cars roughly every 60,000 miles or so. Every time a vehicle accelerates, brakes or simply drives down the road, the friction between its tires and the pavement creates tiny fragments of rubber, known as tire wear particles.

Driving a car or even riding in a bus is a bit like dragging an eraser across the planet, except the crumbs are microplastics. Toxic microplastics.

Dr. Britta Baechler

Director, Ocean Plastics Research, as quoted in Eos magazine

Tires are made from a complex mix of natural and synthetic rubber along with a range of additives, fillers and chemical compounds—some of which, like the preservative 6PPD, have been shown to be highly toxic to coho salmon when they break down into derivative product 6PPD-Q in the environment—even in tiny concentrations.

Some studies have shown that a single vehicle’s tires can emit more than two trillion particles per mile driven—and that the average person generates nearly two pounds of tire particles per year! Once these particles are shed from tires, they don’t just disappear. Some are small and light enough to become airborne, drifting away from roadways as dust. Others settle on road surfaces, where they accumulate until the next heavy rain washes them into storm drains and from there, into streams, rivers and eventually the ocean.

That’s why tire wear particles are now considered one of the top sources of microplastics to the environment. In fact, until recent developments in analytical methods, scientists weren’t reliably able to detect tire wear particles in microplastic counts—thus, these pesky microplastics may have been evading our detection for years.

Why green infrastructure may be one of our best near-term solutions

Unlike some sources of plastic pollution, we can’t simply stop driving overnight. Reformulating tire rubber to be less toxic or shed less material, while promising, will take time to develop, test and scale across the global vehicle fleet. So, what can we do about tire wear particle pollution right now?

This is where green infrastructure comes in. Green infrastructure refers to engineered natural systems (things like bioswales, rain gardens, roadside buffers and permeable pavement) that are designed to slow down, filter and treat stormwater before it reaches rivers, lakes and coastlines. Instead of routing runoff directly into storm drains and out to sea, green infrastructure gives contaminated water a chance to percolate through soil, plants and other natural filtration media, which helps trap microplastics, including tire wear particles, preventing them moving further downstream.

Early research on green infrastructure has been promising, showing that these systems are quite effective at capturing microplastics and other contaminants carried in road runoff. But there’s a critical piece we still don’t fully understand: What would it take to scale up green infrastructure across an entire city, and how much of a dent would that actually make in long-term tire wear particle pollution?

Our research on green infrastructure capture of tire wear particles

Funded by the Tire Industry Project, our plastics science and policy teams at Ocean Conservancy have partnered with the University of Toronto on a new study evaluating the costs and benefits of scaling up green infrastructure at the city level specifically to capture tire wear particles.

If you happen to be driving on the roadways of Portland, Oregon, you may spot our scientists crouched over, precariously scooping dirt with spoons from a sample area on the roadside. Don’t be alarmed—that’s just us doing science! Feel free to give us a wave.

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Ocean Conservancy is currently working to:

• Quantify the scale of pollution: Collect road dust samples from 30 cities globally to measure both total microplastic and tire wear particle concentrations and determine how different variables (population density, road size, rainfall) might influence those values.
• Assess feasibility: Determine what it would take realistically—logistically, financially and spatially—to scale up green infrastructure across an entire city.
• Model positive impacts: Estimate how much city-scale green infrastructure could reduce tire wear particle pollution entering aquatic ecosystems.
• Compare across cities: Understand how well these solutions might translate across different urban contexts, focusing on Portland, Oregon; Toronto, Canada; and London, England as case-study cities.
• Make our findings accessible: Produce a public-facing toolkit to help city planners, engineers and advocates guide real-world implementation of infrastructure that captures tire-wire particles. 

By pairing rigorous science with practical guidance, we hope to help cities move from asking “Could this work?” to confidently building solutions that we know can be effective.

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How can I help?

Tire wear particle pollution can feel like an overwhelming problem. After all, it’s tied to transportation, which most of us rely on every day. But that’s exactly why research like this matters: It gives us a real, near-term path forward that doesn’t require waiting for the entire global transportation system to change first.

You can help by staying engaged with Ocean Conservancy as we continue to dig into solutions for the plastic pollution crisis—one roadway, one storm drain and one city at a time. Together, we can keep working toward a world and ocean free of plastic pollution, forever and for everyone.

The post What are Tire Wear Particles? appeared first on Ocean Conservancy.

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How Ocean Animals Beat the Heat—and the Cold

While our ocean may seem like one giant body of water, its temperatures fluctuate widely. Temperatures can range from below freezing in the deep waters of Antarctica to more than 100°F in shallow coastal waters and everywhere in between. And unlike humans, marine animals can’t just blast the air conditioning or put on a fleecy jacket when they get uncomfortable. Rather, years of evolution have equipped these creatures with several remarkable ways to regulate body temperature and survive in extreme conditions.

Thermoregulation—the process by which animals (and even humans!) maintain their internal body temperatures—is critically important to their survival. Discover how these amazing animals have adapted to life in extreme temperatures.

How do leatherback sea turtles stay warm in cold seas?

Sea turtles are cold-blooded (also known as ectothermic), which means that they rely on external sources of heat. This is why you’ll see turtles, alligators and other reptiles basking in the sun to warm up or certain fish burrowing in the bottom of a lake during freezing months. So, how are leatherback sea turtles able to survive when following swarms of sea jellies to deep, near-freezing waters as far north as Norway?

Leatherbacks rely on an adaptation strategy called countercurrent heat exchange that helps them conserve body heat. The arteries responsible for carrying warm blood from the heart sit right beside the veins bringing in cooler blood from the limbs—the warmth from the arteries transfers to that cooler blood to warm it up before it flows back throughout the body. This exchange can also be reversed when leatherbacks swim back south during nesting season.

In addition to the countercurrent heat exchange, leatherbacks are also gigantothermic. This means that leatherbacks, the largest sea turtle species, can maintain a steady, warm body temperature. Their large body size combined with thick layers of oily, insulating fat and a leathery shell traps internal heat and reduces heat loss.

Are bluefin tuna cold-blooded?

Speaking of heat exchange… While most fish are ectothermic, there are a few that are regionally warm-blooded, or endothermic. Bluefin tuna, for example, are able to conserve heat in specific parts of their body (muscles, viscera, eyes and brain) while their heart remains cold, but not without significant energy expenditure and they cannot keep this up consistently. The bluefin tuna’s heat exchange enables a dense, intertwined system of blood vessels, also known as a “rete mirabile” or “wonderful net” that can reclaim heat. This allows them to hunt in colder waters and maintain their fast reflexes that help them preserve their top predator status.

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Why don’t fish freeze in Antarctica?

Similar to how antifreeze works in your car by disrupting water’s ability to form ice crystals, preventing your car engine from cracking under sub-zero temperatures, certain species of fish create specialized “antifreeze” proteins that prevent the formation of ice in the fish cells and body fluids. Rather than resisting these extreme temperatures that would otherwise freeze them in place, certain fish have developed a rather marvelous adaptation using Antifreeze Glycoproteins (AFGPs). These AFGPs circulate in the bloodstream, disrupting the water molecules to the point where they cannot bond together to form crystals. AFGPs are found in Antarctic notothenioids like the Antarctic toothfish, dragonfish and icefish, as well as the northern cod.

Additionally, Antarctic icefish are the only vertebrates known to have no red blood cells (RBCs) Yep—you read that right. These fish were discovered in 1928 with milky-white blood containing precisely zero hemoglobin. So, how do these fish get the oxygen required for all living creatures on Earth? Antarctic icefish absorb oxygen directly into their blood plasma by diffusing it through their gills and super thin skin. Their wide blood vessels and large hearts allow their very cold and watery blood to move quickly and easily through their circulatory system. No RBCs and antifreeze proteins? Antarctic icefish are an evolutionary marvel. And it appears they’re not alone. In 2025, scientists discovered Asian noodlefishes have completely lost their myoglobin and hemoglobin genes. 

What ocean animals can survive on the floor of the deep sea?

Not many animals have what it takes to survive on the sea floor. However, there are a few creative communities of critters that manage to survive by taking advantage of the special circumstances on the sea floor. Enter hydrothermal vents. Hydrothermal vents are like deep-sea hot springs that form in areas with underwater volcanic activity, where moving tectonic plates create fissures in the ocean floor. Magma-heated water escapes from inside the earth through these cracks in the seafloor, releasing a buffet of rich minerals from Earth’s crust, like sulfur and calcium.

What creature could thrive in waters that fluctuate from near freezing to more than 400°F when these vents erupt? Riftia tubeworms, of course! Commonly known as giant tubeworms or Riftia pachyptila, these worms strategically place themselves in mixed-temperature zones, mere inches between hydrothermal vents. These worms can grow to eight feet long and have a symbiotic relationship with chemosynthetic bacteria. The tube worm absorbs oxygen and hydrogen sulfide through its bright red appendage called a plume, which the bacteria then use in the process of chemosynthesis. In turn, the worm receives energy from the bacteria.

Other animals live on the vents, too, including other worms, deep-sea mussels, gastropods and deep-sea octopuses. There are even zoarcid fish that specialize in preying on invertebrates that live on hydrothermal vents. Unlike other deep-sea creatures that need to withstand very cold waters, these guys need to be able to handle the heat—the water around hydrothermal vents can reach up to 660 degrees Fahrenheit!

As you can see, thermoregulation can be the difference between life and death in extreme environments throughout the ocean. While these adaptations showcase incredible evolutionary wonders, they also help scientists understand how species respond to a changing climate. Threats like historic marine heatwaves, intense hurricanes fueled by warming waters and mass coral bleaching events paint a clear picture: The climate crisis is here, and it will only get worse without immediate action. Join us in calling for our elected leaders to take action to mitigate climate change now.

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