Over the years, beachcombers have stumbled upon a wild assortment of oddities. Some are living creatures, others are dead marine life, and a few are plain odd inanimate items. A strange sea foam once rolled ashore, dragging a mishmash of everyday objects that you don’t normally see on a shoreline. Cast‑off shells, mysterious casings, and even a phallic‑shaped animal worthy of Freud’s nightmares have been found washed or crawled onto sand. This roundup of ten bizarre objects discovered on beaches shows just how strange the deep can be.
10 Bizarre Objects You’ll Find on the Shoreline
10 Glowing Rock
On 22 February 2021, Mantana Dao Pibul set out for a stroll along a beach in Thailand’s Nakhon Si Thammarat province. She spotted a piece of coral and, thinking it a souvenir, picked it up. When she shone her phone’s flashlight on it, the rock emitted a eerie red glow, prompting her to wonder if it might be a meteorite. Back home, the glow shifted from red to a vivid purple. Neither Mantana nor her friends could identify the mineral, and she now hopes an expert can explain what she unearthed during her seaside walk.
9 Blue Dragons
The creature is a light‑blue, lizard‑like animal whose dark‑blue markings trace its back. Its ‘feet’ are not reptilian; instead they explode into star‑shaped, spiky rays of varying length. Commonly called a blue dragon, scientists refer to it as Glaucus atlanticus, a nudibranch—a shell‑less gastropod. While it usually drifts on the ocean surface, wind gusts sometimes push whole fleets onto Australian shores. In addition to the 3‑centimetre Glaucus atlanticus, a larger 13‑centimetre relative, Glaucilla marginate, also known as a blue dragon, can be washed ashore.
Both species belong to the pleuston, organisms that live half in water and half in the air, relying on wind to transport them. Though they cannot swim against currents, these tiny animals can spin and even perform somersaults by inhaling air, creating an internal bubble that keeps them buoyant and upside‑down.
Despite their limited mobility, blue dragons are fierce predators in their miniature realm, feeding on colonies of hydroids (called blue buttons) and polyps (bluebottles). Their striking coloration provides camouflage against the ocean’s surface, shielding them from larger predators.
8 Gooseneck Barnacles
While vacationing with his family in Caernarfon, North Wales, Martyn Green noticed his wife Gemma had picked up what looked like driftwood. Upon closer inspection, Green realized the object was teeming with thousands of tentacled sea creatures, making it seem otherworldly.
A quick internet search by Green and his son revealed the find to be gooseneck barnacles. Green also discovered a culinary twist: in Spain and Portugal these barnacles are a delicacy, selling for about £25 (≈ US $34.82) each. He estimated the ‘driftwood’ could contain roughly 2,000 barnacles—a tidy haul.
7 Sea Foam
The bizarre sea foam that blanketed New South Wales beaches in December 2020 was a moving gift. Storms mixed seawater with algae, salts, fats and pollutants, forming a thick frothy layer. This strange foam not only looked odd but also ferried an assortment of unexpected items ashore—deadly sea snakes, giant spiders, whole trees, logs, and even half a cow. A dog needed rescue from the foam, and authorities warned locals and tourists to stay away from the water for safety.
6 Unidentified Carcass
In February 2020, a mysterious carcass washed up on a Mexican beach at Destiladeras, Jalisco, sparking speculation that it might be a dolphin. However, its lack of eyes and unusually long, curved teeth set it apart from typical dolphin dentition.
Some suggested the creature could be an eel, noting its lower body lacked fins and flukes and was far narrower than a dolphin’s. Yet fishermen and locals could not reach a consensus on its identity.
The absence of eyes hinted the animal might have originated from deep waters—perhaps the 1,000‑metre‑deep zone off Puerto Vallarta—but no one could explain how such a deep‑sea inhabitant could be carried to shore.
5 Decapitated “Corpse”
During a beach cleanup at Perdido Bay in November 2020, a volunteer known only as Kathleen stumbled upon more than ordinary debris. She uncovered a headless, barnacle‑covered figure, which she promptly reported to Ocean Hour, the nonprofit she was assisting.
Although the object resembled a human corpse at first glance, authorities later identified it as a mannequin. Its origin and the length of time it spent submerged remain unresolved mysteries.
4 Sea Pork
A strange mass appeared on the sands of Urangan Beach in Hervey Bay, Queensland, in February 2020. The specimen showed discernible eyes, a mouth, and part of a head, prompting a Facebook post from the discoverer seeking identification. Commenters ruled out stonefish due to its smooth skin, unlike the rough texture of stonefish.
Speculation ranged from soft coral and ambergris to shark excrement and even a whale placenta. Professor Sandie Degnan of the University of Queensland’s School of Biological Sciences suggested the mass was likely a sea pork—a type of sea squirt related to cunjevois, known for squirting water. Fishermen often eviscerate these creatures and use their guts as bait.
3 Hoodwinker
Witnesses described the creature as an enormous floating head, complete with fins. The sighting occurred on 19 February 2019 when the animal washed ashore at Coal Oil Point Reserve near Santa Barbara, California. Conservationist Jessica Nielsen posted photos on the reserve’s Facebook page, catching the eye of UC Santa Barbara professor Thomas Turner, who also documented it on iNaturalist.
In Australia, marine scientist Marianne Nyegaard was alerted to the find and suspected it to be a fish she had previously named the hoodwinker. Genetic testing confirmed the specimen as Mola tecta, a species of sunfish. These fish can reach eight feet in length and weigh several thousand pounds.
The appearance of a hoodwinker on a Californian beach puzzled researchers, as they are rarely seen in the Northern Hemisphere. Possible explanations include stray migration, climate‑driven ocean warming, or shifts in currents that moved their jellyfish prey northward, prompting the fish to follow. The mystery remains unresolved.
2 Worm Casings
The delicate tubes resemble icy twigs, yet they are not plant material. Known as tube worm casings, they are the discarded shells of cellophane worms (Spichaetopterus costarum) that wash up on Oregon’s coastline. Tiffany Boothe of Seaside Aquarium explains that these worms live just below the low‑tide line, building sand‑encrusted tubes that surf, currents, and upwellings later dislodge and scatter.
CoastWatch’s Fawn Custer notes that the worms feel like hair and are always present, but certain conditions cause them to be unearthed and deposited onshore by wave action. The worms feed by sucking tiny particles through their tubes, which rise close to the sand surface. When the tubes detach, the worms secrete a goo that eventually hardens into a new tube.
1 “Sea Penis”
The priapulida, nicknamed the ‘sea penis’ for its phallic shape, ranks among the most bizarre marine creatures ever to strand on a beach. Named after the Greek god Priapus, who symbolizes male generative power, this unsegmented worm dwells on the ocean floor and is rarely encountered.
Australian freediver Josie Jones discovered one off Rye Front Beach in Victoria, noting that about 160 species of the worm inhabit the area beneath the pier. The worm’s resemblance to a penis becomes even more pronounced when it releases its eggs and sperm into the sea.
Jones shared a photo of the priapulida on Facebook, sparking a flurry of jokes, many of the sophomoric variety. Comedian Mark Normand even chimed in, quipping, “Ladies, if you aren’t satisfied at home, remember there are plenty of fish in the sea.”