Big and Small Underwater Faces — 3rd Place. Trips to the Antarctic Peninsula always yield amazing encounters with leopard seals (Hydrurga leptonyx). Boldly approaching me and baring his teeth, this individual was keen to point out that this part of Antarctica was his territory. This picture was shot at dusk, resulting in the rather moody atmosphere.   Credit: Lars von Ritter Zahony (Germany) / World Ocean’s Day Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent every weekday. The striking eye of a humpback whale named Sweet Girl peers at the camera. Just four days later, she would be dead, hit by a speeding boat and one of the 20,000 whales killed by ship strikes each year. Photographer Rachel Moore’s captivating image (seen below) of Sweet Girl earned top honors at the 2025 United Nations World Oceans Day Photo Competition. Wonder: Sustaining What Sustains Us — WinnerThis photo, taken in Mo’orea, French Polynesia in 2024, captures the eye of a humpback whale named Sweet Girl, just days before her tragic death. Four days after I captured this intimate moment, she was struck and killed by a fast-moving ship. Her death serves as a heartbreaking reminder of the 20,000 whales lost to ship strikes every year. We are using her story to advocate for stronger protections, petitioning for stricter speed laws around Tahiti and Mo’orea during whale season. I hope Sweet Girl’s legacy will spark real change to protect these incredible animals and prevent further senseless loss.Credit: Rachel Moore (USA) / United Nations World Oceans Day www.unworldoceansday.org Now in its twelfth year, the competition coordinated in collaboration between the UN Division for Ocean Affairs and the Law of the Sea, DivePhotoGuide (DPG), Oceanic Global, and  the Intergovernmental Oceanographic Commission of UNESCO. Each year, thousands of underwater photographers submit images that judges award prizes for across four categories: Big and Small Underwater Faces, Underwater Seascapes, Above Water Seascapes, and Wonder: Sustaining What Sustains Us. This year’s winning images include a curious leopard seal, a swarm of jellyfish, and a very grumpy looking Japanese warbonnet. Given our oceans’ perilous state, all competition participants were required to sign a charter of 14 commitments regarding ethics in photography. Underwater Seascapes — Honorable MentionWith only orcas as their natural predators, leopard seals are Antarctica’s most versatile hunters, preying on everything from fish and cephalopods to penguins and other seals. Gentoo penguins are a favored menu item, and leopard seals can be observed patrolling the waters around their colonies. For this shot, I used a split image to capture both worlds: the gentoo penguin colony in the background with the leopard seal on the hunt in the foreground.Credit: Lars von Ritter Zahony (Germany) / United Nations World Oceans Day www.unworldoceansday.org Above Water Seascapes – WinnerA serene lake cradled by arid dunes, where a gentle stream breathes life into the heart of Mother Earth’s creation: Captured from an airplane, this image reveals the powerful contrasts and hidden beauty where land and ocean meet, reminding us that the ocean is the source of all life and that everything in nature is deeply connected. The location is a remote stretch of coastline near Shark Bay, Western Australia.Credit: Leander Nardin (Austria) / United Nations World Oceans Day www.unworldoceansday.org Above Water Seascapes — 3rd PlaceParadise Harbour is one of the most beautiful places on the Antarctic Peninsula. When I visited, the sea was extremely calm, and I was lucky enough to witness a wonderfully clear reflection of the Suárez Glacier (aka Petzval Glacier) in the water. The only problem was the waves created by our speedboat, and the only way to capture the perfect reflection was to lie on the bottom of the boat while it moved towards the glacier.Credit: Andrey Nosik (Russia) / United Nations World Oceans Day www.unworldoceansday.org Underwater Seascapes — 3rd Place“La Rapadura” is a natural hidden treasure on the northern coast of Tenerife, in the Spanish territory of the Canary Islands. Only discovered in 1996, it is one of the most astonishing underwater landscapes in the world, consistently ranking among the planet’s best dive sites. These towering columns of basalt are the result of volcanic processes that occurred between 500,000 and a million years ago. The formation was created when a basaltic lava flow reached the ocean, where, upon cooling and solidifying, it contracted, creating natural structures often compared to the pipes of church organs. Located in a region where marine life has been impacted by once common illegal fishing practices, this stunning natural monument has both geological and ecological value, and scientists and underwater photographers are advocating for its protection. (Model: Yolanda Garcia)Credit: Pedro Carrillo (Spain) / United Nations World Oceans Day www.unworldoceansday.org Underwater Seascapes — WinnerThis year, I had the incredible opportunity to visit a jellyfish lake during a liveaboard trip around southern Raja Ampat, Indonesia. Being surrounded by millions of jellyfish, which have evolved to lose their stinging ability due to the absence of predators, was one of the most breathtaking experiences I’ve ever had.Credit: Dani Escayola (Spain) / United Nations World Oceans Day www.unworldoceansday.org Underwater Seascapes — 2nd PlaceThis shot captures a school of rays resting at a cleaning station in Mauritius, where strong currents once attracted them regularly. Some rays grew accustomed to divers, allowing close encounters like this. Sadly, after the severe bleaching that the reefs here suffered last year, such gatherings have become rare, and I fear I may not witness this again at the same spot.Credit: Gerald Rambert (Mauritius) / United Nations World Oceans Day www.unworldoceansday.org Wonder: Sustaining What Sustains Us — 3rd PlaceShot in Cuba’s Jardines de la Reina—a protected shark sanctuary—this image captures a Caribbean reef shark weaving through a group of silky sharks near the surface. Using a slow shutter and strobes as the shark pivoted sharply, the motion blurred into a wave-like arc across its head, lit by the golden hues of sunset. The abundance and behavior of sharks here is a living symbol of what protected oceans can look like.Credit: Steven Lopez (USA) / United Nations World Oceans Day www.unworldoceansday.org  Above Water Seascapes — 2nd PlaceNorthern gannets (Morus bassanus) soar above the dramatic cliffs of Scotland’s Hermaness National Nature Reserve, their sleek white bodies and black-tipped wings slicing through the Shetland winds. These seabirds, the largest in the North Atlantic, are renowned for their striking plunge-dives, reaching speeds up to 100 kph (60 mph) as they hunt for fish beneath the waves. The cliffs of Hermaness provide ideal nesting sites, with updrafts aiding their take-offs and landings. Each spring, thousands return to this rugged coastline, forming one of the UK’s most significant gannet colonies. It was a major challenge to take photos at the edge of these cliffs at almost 200 meters (650 feet) with the winds up to 30 kph (20 mph).Credit: Nur Tucker (UK/Turkey) / United Nations World Oceans Day www.unworldoceansday.org Above Water Seascapes — Honorable MentionA South Atlantic swell breaks on the Dungeons Reef off the Cape Peninsula, South Africa, shot while photographing a big-wave surf session in October 2017. It’s the crescendoing sounds of these breaking swells that always amazes me.Credit: Ken Findlay (South Africa) / United Nations World Oceans Day www.unworldoceansday.org Wonder: Sustaining What Sustains Us — Honorable MentionHumpback whales in their thousands migrate along the Ningaloo Reef in Western Australia every year on the way to and from their calving grounds. In four seasons of swimming with them on the reef here, this is the only encounter I’ve had like this one. This pair of huge adult whales repeatedly spy-hopped alongside us, seeking to interact with and investigate us, leaving me completely breathless. The female in the foreground was much more confident than the male behind and would constantly make close approaches, whilst the male hung back a little, still interested but shy. After more than 10 years working with wildlife in the water, this was one of the best experiences of my life.Credit: Ollie Clarke (UK) / United Nations World Oceans Day www.unworldoceansday.org Big and Small Underwater Faces — 2nd PlaceOn one of my many blackwater dives in Anilao, in the Philippines, my guide and I spotted something moving erratically at a depth of around 20 meters (65 feet), about 10 to 15 centimeters in size. We quickly realized that it was a rare blanket octopus (Tremoctopus sp.). As we approached, it opened up its beautiful blanket, revealing its multicolored mantle. I managed to take a few shots before it went on its way. I felt truly privileged to have captured this fascinating deep-sea cephalopod. Among its many unique characteristics, this species exhibits some of the most extreme sexual size-dimorphism in nature, with females weighing up to 40,000 times more than males.Credit: Giacomo Marchione (Italy) / United Nations World Oceans Day www.unworldoceansday.org Big and Small Underwater Faces – WinnerThis photo of a Japanese warbonnet (Chirolophis japonicus) was captured in the Sea of Japan, about 50 miles (80 kilometers) southwest of Vladivostok, Russia. I found the ornate fish at a depth of about 30 meters (100 feet), under the stern of a shipwreck. This species does not appear to be afraid of divers—on the contrary, it seems to enjoy the attention—and it even tried to sit on the dome port of my camera.Credit: Andrey Nosik (Russia) / United Nations World Oceans Day www.unworldoceansday.org Wonder: Sustaining What Sustains Us — 2nd PlaceA juvenile pinnate batfish (Platax pinnatus) captured with a slow shutter speed, a snooted light, and deliberate camera panning to create a sense of motion and drama. Juvenile pinnate batfish are known for their striking black bodies outlined in vibrant orange—a coloration they lose within just a few months as they mature. I encountered this restless subject in the tropical waters of Indonesia’s Lembeh Strait. Capturing this image took patience and persistence over two dives, as these active young fish constantly dart for cover in crevices, making the shot particularly challenging.Credit: Luis Arpa (Spain) / United Nations World Oceans Day www.unworldoceansday.org

Extra-sensory perception The nine-armed octopus and the oddities of the cephalopod nervous system A mix of autonomous and top-down control manage the octopus's limbs. Kenna Hughes-Castleberry – Jun 7, 2025 8:00 am | 19 Credit: Nikos Stavrinidis / 500px Credit: Nikos Stavrinidis / 500px Story text Size Small Standard Large Width * Standard Wide Links Standard Orange * Subscribers only   Learn more With their quick-change camouflage and high level of intelligence, it’s not surprising that the public and scientific experts alike are fascinated by octopuses. Their abilities to recognize faces, solve puzzles, and learn behaviors from other octopuses make these animals a captivating study. To perform these processes and others, like crawling or exploring, octopuses rely on their complex nervous system, one that has become a focus for neuroscientists. With about 500 million neurons—around the same number as dogs—octopuses’ nervous systems are the most complex of any invertebrate. But, unlike vertebrate organisms, the octopus’s nervous system is also decentralized, with around 350 million neurons, or 66 percent of it, located in its eight arms. “This means each arm is capable of independently processing sensory input, initiating movement, and even executing complex behaviors—without direct instructions from the brain,” explains Galit Pelled, a professor of Mechanical Engineering, Radiology, and Neuroscience at Michigan State University who studies octopus neuroscience. “In essence, the arms have their own ‘mini-brains.’” A decentralized nervous system is one factor that helps octopuses adapt to changes, such as injury or predation, as seen in the case of an Octopus vulgaris, or common octopus, that was observed with nine arms by researchers at the ECOBAR lab at the Institute of Marine Research in Spain between 2021 and 2022. By studying outliers like this cephalopod, researchers can gain insight into how the animal’s detailed scaffolding of nerves changes and regrows over time, uncovering more about how octopuses have evolved over millennia in our oceans. Brains, brains, and more brains Because each arm of an octopus contains its own bundle of neurons, the limbs can operate semi-independently from the central brain, enabling faster responses since signals don’t always need to travel back and forth between the brain and the arms. In fact, Pelled and her team recently discovered that “neural signals recorded in the octopus arm can predict movement type within 100 milliseconds of stimulation, without central brain involvement.” She notes that “that level of localized autonomy is unprecedented in vertebrate systems.” Though each limb moves on its own, the movements of the octopus’s body are smooth and conducted with a coordinated elegance that allows the animal to exhibit some of the broadest range of behaviors, adapting on the fly to changes in its surroundings. “That means the octopus can react quickly to its environment, especially when exploring, hunting, or defending itself,” Pelled says. “For example, one arm can grab food while another is feeling around a rock, without needing permission from the brain. This setup also makes the octopus more resilient. If one arm is injured, the others still work just fine. And because so much decision-making happens at the arms, the central brain is freed up to focus on the bigger picture—like navigating or learning new tasks.” As if each limb weren’t already buzzing with neural activity, things get even more intricate when researchers zoom in further—to the nerves within each individual sucker, a ring of muscular tissue, which octopuses use to sense and taste their surroundings. “There is a sucker ganglion, or nerve center, located in the stalk of every sucker. For some species of octopuses, that’s over a thousand ganglia,” says Cassady Olson, a graduate student at the University of Chicago who works with Cliff Ragsdale, a leading expert in octopus neuroscience. Given that each sucker has its own nerve centers—connected by a long axial nerve cord running down the limb—and each arm has hundreds of suckers, things get complicated very quickly, as researchers have historically struggled to study this peripheral nervous system, as it’s called, within the octopus’s body. “The large size of the brain makes it both really exciting to study and really challenging,” says Z. Yan Wang, an assistant professor of biology and psychology at the University of Washington. “Many of the tools available for neuroscience have to be adjusted or customized specifically for octopuses and other cephalopods because of their unique body plans.” While each limb acts independently, signals are transmitted back to the octopus’s central nervous system. The octopus’ brain sits between its eyes at the front of its mantle, or head, couched between its two optic lobes, large bean-shaped neural organs that help octopuses see the world around them. These optic lobes are just two of the over 30 lobes experts study within the animal’s centralized brain, as each lobe helps the octopus process its environment. This elaborate neural architecture is critical given the octopus’s dual role in the ecosystem as both predator and prey. Without natural defenses like a hard shell, octopuses have evolved a highly adaptable nervous system that allows them to rapidly process information and adjust as needed, helping their chances of survival. Some similarities remain While the octopus’s decentralized nervous system makes it a unique evolutionary example, it does have some structures similar to or analogous to the human nervous system. “The octopus has a central brain mass located between its eyes, and an axial nerve cord running down each arm (similar to a spinal cord),” says Wang. “The octopus has many sensory systems that we are familiar with, such as vision, touch (somatosensation), chemosensation, and gravity sensing.” Neuroscientists have homed in on these similarities to understand how these structures may have evolved across the different branches in the tree of life. As the most recent common ancestor for humans and octopuses lived around 750 million years ago, experts believe that many similarities, from similar camera-like eyes to maps of neural activities, evolved separately in a process known as convergent evolution. While these similarities shed light on evolution's independent paths, they also offer valuable insights for fields like soft robotics and regenerative medicine. Occasionally, unique individuals—like an octopus with an unexpected number of limbs—can provide even deeper clues into how this remarkable nervous system functions and adapts. Nine arms, no problem In 2021, researchers from the Institute of Marine Research in Spain used an underwater camera to follow a male Octopus vulgaris, or common octopus. On its left side, three arms were intact, while the others were reduced to uneven, stumpy lengths, sharply bitten off at varying points. Although the researchers didn’t witness the injury itself, they observed that the front right arm—known as R1—was regenerating unusually, splitting into two separate limbs and giving the octopus a total of nine arms. “In this individual, we believe this condition was a result of abnormal regeneration [a genetic mutation] after an encounter with a predator,” explains Sam Soule, one of the researchers and the first author on the corresponding paper recently published in Animals. The researchers named the octopus Salvador due to its bifurcated arm coiling up on itself like the two upturned ends of Salvador Dali’s moustache. For two years, the team studied the cephalopod’s behavior and found that it used its bifurcated arm less when doing “riskier” movements such as exploring or grabbing food, which would force the animal to stretch its arm out and expose it to further injury. “One of the conclusions of our research is that the octopus likely retains a long-term memory of the original injury, as it tends to use the bifurcated arms for less risky tasks compared to the others,” elaborates Jorge Hernández Urcera, a lead author of the study. “This idea of lasting memory brought to mind Dalí’s famous painting The Persistence of Memory, which ultimately became the title of the paper we published on monitoring this particular octopus.” While the octopus acted more protective of its extra limb, its nervous system had adapted to using the extra appendage, as the octopus was observed, after some time recovering from its injuries, using its ninth arm for probing its environment. “That nine-armed octopus is a perfect example of just how adaptable these animals are,” Pelled adds. “Most animals would struggle with an unusual body part, but not the octopus. In this case, the octopus had a bifurcated (split) arm and still used it effectively, just like any other arm. That tells us the nervous system didn’t treat it as a mistake—it figured out how to make it work.” Kenna Hughes-Castleberry is the science communicator at JILA (a joint physics research institute between the National Institute of Standards and Technology and the University of Colorado Boulder) and a freelance science journalist. Her main writing focuses are quantum physics, quantum technology, deep technology, social media, and the diversity of people in these fields, particularly women and people from minority ethnic and racial groups. Follow her on LinkedIn or visit her website. 19 Comments

A New, Shape-Shifting ‘Flapjack’ Octopus Has Been Discovered in the Deep Sea Off the Coast of Australia The tiny Carnarvon flapjack octopus is the latest of ten species described by Australian scientists after a 2022 research trip The newly described octopus, Opisthoteuthis carnarvonensis, has red tentacles. Cindy Bessey / CSIRO A new species of shape-shifting octopus has just been described by scientists in Australia. The tiny cephalopod grows only about 1.6 inches across, but it can survive more than half a mile beneath the ocean’s surface. Scientists have named the octopus the Carnarvon flapjack (Opisthoteuthis carnarvonensis), after the Carnarvon Canyon Marine Park off the coast of Western Australia, where it was found back in 2022. The “flapjack” part of its name comes from its shape-shifting nature—flapjack octopuses can flatten their bodies into pancake-like discs. The octopus marks the tenth new species to be described from specimens collected by researchers aboard the Investigator, a vessel led by the Commonwealth Scientific and Industrial Research Organization (CSIRO), Australia’s national scientific research agency. The ship has been charting Australia’s waters for years, mapping the seafloor and studying marine life. During the 2022 expedition, the team used high-tech cameras, nets and sleds to collect samples and snap photographs deep below the ocean’s surface. Many of the specimens they found are thought to be new species, according to a statement from CSIRO. Tristan Verhoeff, a volunteer systematic taxonomist at the Tasmanian Museum and Art Gallery, went through a long, multi-step process to name the new octopus and verify that it had never been seen before. “It is exciting, but at the same time, there is pressure to do it right,” he says to Crystal McKay at theAustralian Broadcasting Corporation. “It is easy to think you have a new species when you don’t. That’s why it takes time, as you need to compare specimens and literature descriptions.” To name the new species, Verhoeff had to collect measurements of the octopus, count its suckers, dissect its organs and take detailed photos, per the Australian Broadcasting Corporation. Then, researchers compared that information to records of already identified species. Top view of the new octopus species (Opisthoteuthis carnarvonensis) Cindy Bessey / CSIRO The Carnarvon flapjack is a type of deep-sea dwelling “dumbo” octopus, so nicknamed because the ear-like fins just above their eyes give them a resemblance to the popular Disney elephant. “Dumbo octopus are a rare and unusual species that live on the seafloor,” adds Verhoeff in the statement. “They reproduce and grow slowly, are very soft and gelatinous and, unlike other octopus, they produce no ink and cannot change color.” Some of the Investigator’s other recent discoveries include the painted hornshark, the parallel-spine scorpionfish and an “incredibly rare” blind cusk eel. These creatures all add to scientists’ understanding of seafloor habitats in Western Australia. A researcher holds the painted hornshark, which was discovered on the Investigator's 2022 expedition. Frederique Olivier / CSIRO Scientists discovered the parallel-spine scorpionfish on the 2022 research voyage. Frederique Olivier / CSIRO The findings also “help marine managers, such as Parks Australia, better conserve and protect the incredible diversity of marine life that inhabits Australia’s oceans,” says Venetia Joscelyne, the CSIRO Marine National Facility team leader, to the Australian Broadcasting Corporation. “Incredibly, scientists estimate that there are likely more than 1,000 new species waiting to be described from specimens collected on CSIRO RV Investigator voyages over the past ten years,” she adds in the statement. If you want to feel like you’re part of the adventure, you can watch a live stream of the vessel on its journey of discovery. Get the latest stories in your inbox every weekday.