The bottlenose dolphin shelling behavior has become the focus of new scientific attention after researchers captured rare footage of dolphins using large seashells to help catch fish off Queensland, Australia. The newly documented observations provide an extraordinary look at how Indo-Pacific bottlenose dolphins can use objects in their environment as hunting tools and may also offer clues about how complex feeding techniques are learned and passed between generations.
Key Points Summary
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║ – Researchers documented Indo-Pacific bottlenose dolphins using large empty shells to catch fish off Queensland. ║
║ – The newly reported observations occurred in the Great Sandy Marine Park near Hervey Bay. ║
║ – Two separate shelling events involving three dolphins were observed in 2025. ║
║ – One observation involved a mother and calf, raising the possibility that the young dolphin learned the technique through social observation. ║
║ – Shelling had previously been documented in Shark Bay in Western Australia, making the Queensland discovery especially significant. ║
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What Is Dolphin Shelling?
Shelling is a rare feeding strategy in which a bottlenose dolphin uses a large empty marine shell as part of the process of catching and eating prey.
The technique is remarkably different from ordinary dolphin hunting. Instead of simply chasing a fish through the water and swallowing it directly, the dolphin uses a shell as a temporary container. A fish is driven into or becomes trapped within the shell, after which the dolphin carries the shell toward the surface.
The dolphin then raises and tilts the shell so that water drains away and the fish becomes accessible. The prey can subsequently fall or slide toward the dolphin’s mouth.
This sequence requires precise timing and coordination. The animal has to locate a suitable shell, manipulate it with its rostrum, maintain control of the object and position it correctly to retrieve the fish.
That makes shelling an important example of tool-assisted foraging in a wild marine mammal.
New Footage From Queensland Changes the Picture
The latest research has attracted attention because the behavior was documented off Australia’s eastern coast.
Researchers studying Indo-Pacific bottlenose dolphins observed two separate shelling events in the Great Sandy Marine Park near Hervey Bay, Queensland. The observations were made on July 6 and October 1, 2025, and were subsequently reported in a scientific study published in Marine Mammal Science in August 2026.
The observations involved three individual dolphins.
The footage gives researchers something particularly valuable: visual evidence of the animals actually manipulating the shells during hunting.
Shelling is difficult to observe because the behavior can happen quickly and often begins underwater. A dolphin may disappear beneath the surface and return moments later carrying an object, leaving observers with only a brief opportunity to understand what happened.
The Queensland footage therefore provides a rare window into a feeding technique that scientists have known about but have rarely been able to observe directly.
How the Dolphins Use Shells to Catch Fish
The hunting process appears deceptively simple when viewed from a distance, but several coordinated actions are involved.
First, the dolphin encounters a fish that can be associated with the shell. The prey may be driven into the opening or become contained within the shell.
The dolphin then positions its rostrum around the shell and lifts the object.
Once the shell reaches the surface, the dolphin manipulates it. Tilting the shell allows water to escape while leaving the fish inside or near the opening.
Eventually, the fish is positioned so the dolphin can capture it.
The method effectively transforms an empty shell into a temporary fishing container.
This is particularly impressive because dolphins do not have hands or grasping limbs. Their rostrum, body movements and mouth must perform functions that terrestrial tool-using animals might accomplish with their forelimbs.
The Shells Are Not Ordinary Small Seashells
The objects involved are large marine gastropod shells, including bailer shells that can reach substantial sizes.
Their shape makes them suitable for temporarily containing prey and for being manipulated by a dolphin.
A dolphin needs more than an available object, however. The shell must be sufficiently large and accessible to make the technique worthwhile.
This raises an important ecological question for researchers: whether the availability of suitable shells and prey helps determine where shelling develops.
If the behavior depends on a particular combination of shell type, habitat and fish species, environmental conditions could play an important role in shaping the hunting technique.
A Mother and Calf Provide a Fascinating Clue
Perhaps the most intriguing part of the new observations involves a mother dolphin and her calf.
Researchers observed an adult female using a shell during a feeding event. Shortly afterward, the calf was seen handling a shell in a manner consistent with the same general technique.
The observation does not establish that the mother deliberately taught the calf in the same way a human parent might provide formal instruction. Scientists therefore remain cautious about describing the event as direct teaching.
However, the timing is important.
A young dolphin spends considerable time with its mother and has repeated opportunities to watch how she finds food and responds to different situations. If the calf observes a complex feeding technique and later attempts something similar, social learning becomes a compelling possibility.
This could help explain how specialized hunting behaviors become established within dolphin communities.
Why Social Learning Matters in Dolphins
Dolphins are highly social animals, and their societies provide numerous opportunities for individuals to observe one another.
Young dolphins do not simply inherit every aspect of their behavior genetically. They also develop skills through experience and interaction with other dolphins.
Foraging methods are especially interesting because they can vary between populations.
A technique that is common in one dolphin community may be rare or absent in another, even when the animals belong to the same species.
Such differences can indicate that behavior is being learned socially rather than being entirely hardwired.
The Queensland observation adds another possible example to this growing body of evidence.
Shelling Was Already Known From Western Australia
Before the Queensland observations, shelling had been documented in bottlenose dolphins at Shark Bay in Western Australia.
Researchers studying Shark Bay dolphins have spent years documenting unusual feeding techniques and social behaviors.
Shelling in Shark Bay attracted particular attention because researchers found evidence that the technique could spread between dolphins through social connections.
A 2020 study examining the Shark Bay population found that shelling was associated with social transmission between dolphins that were not necessarily mothers and offspring.
That finding was significant because it showed that an innovative hunting technique could spread through a dolphin social network.
The Queensland discovery introduces a different possibility: maternal transmission may also play a role in at least some circumstances.
Two Distant Populations, Similar Hunting Solution
The location of the new observations is one of the reasons scientists are so interested in them.
Shark Bay lies on Australia’s western coast, while Hervey Bay is on the country’s eastern side. The populations are separated by thousands of miles.
Yet dolphins in both locations appear to have developed remarkably similar ways of using shells to obtain fish.
This creates an intriguing evolutionary question.
Did the technique spread between distant dolphin populations at some point in the past, or did similar environmental challenges lead the populations to develop the technique independently?
The available evidence makes independent innovation an important possibility.
If separate dolphin populations can arrive at comparable solutions to similar feeding challenges, that would demonstrate an impressive degree of behavioral flexibility.
It would also suggest that dolphin intelligence is not simply expressed through communication or memory but through practical problem-solving in the wild.
Shelling Is Different From Dolphin Sponging
Shelling is sometimes discussed alongside another famous example of dolphin tool use: sponging.
Sponging has been documented among some bottlenose dolphins in Shark Bay. Dolphins place marine sponges over their rostrums while searching for prey on the seafloor.
The sponge can help protect the sensitive rostrum as the dolphin probes areas containing rough or potentially abrasive material.
Although both behaviors involve tools, their purposes are different.
Sponging involves using a sponge while searching for prey, whereas shelling involves manipulating a shell as part of the process of capturing and retrieving prey.
The difference is important because it shows that dolphin tool use is not a single behavior. Dolphins can develop different object-based strategies depending on their environment and feeding opportunities.
What the Behavior Says About Dolphin Intelligence
The discovery does not mean dolphins think exactly like humans, but it does demonstrate sophisticated behavioral flexibility.
To successfully shell, a dolphin must connect several events.
It needs to recognize a useful object, understand how the object can be manipulated, coordinate movements to carry it and adjust its behavior based on what happens to the prey.
The dolphin also needs enough experience to determine when the technique is worthwhile.
This combination of perception, coordination, memory and problem-solving makes shelling a compelling subject for scientists studying animal cognition.
It demonstrates that complex intelligence can evolve in animals with bodies and environments very different from those of humans.
Why Researchers Need More Observations
Despite the importance of the new footage, scientists still have many unanswered questions.
The number of documented shelling events remains very small. Researchers need more observations to determine how common the behavior is in Queensland.
They also want to know whether only a small number of individuals use shells or whether many dolphins in the population know the technique.
Another question concerns age.
If young dolphins regularly attempt shelling after watching adults, researchers could investigate how long it takes them to become proficient. They could also determine whether unsuccessful attempts are common during the learning process.
Long-term studies could reveal whether shelling becomes more frequent in particular dolphin families or social groups.
Could Dolphins Have Local Hunting Traditions?
One of the most interesting possibilities is that shelling may represent a local behavioral tradition.
In animal behavior research, traditions can develop when individuals learn behaviors from other members of their community and those behaviors persist over time.
Dolphin populations are particularly interesting in this regard because they maintain complex social relationships.
A young dolphin that watches an experienced adult may acquire a technique that another dolphin in a different community never learns.
Over generations, these differences can create distinct behavioral patterns between populations.
Shelling provides an unusually clear way to study this process because the behavior involves a visible object and a recognizable sequence of actions.
Why the Queensland Discovery Is Important
The new observations broaden scientific understanding of dolphin tool use in several ways.
First, they show that shell-based hunting occurs on Australia’s eastern coast, not only at the previously documented western location.
Second, the footage provides direct visual evidence of the behavior.
Third, the mother-and-calf observation raises important questions about how specialized feeding techniques are acquired.
Finally, the discovery suggests that dolphins may repeatedly develop innovative solutions when faced with particular ecological challenges.
Together, these findings reinforce the idea that dolphin behavior can be both flexible and culturally influenced.
What Scientists May Learn Next
Future research could focus on identifying more shelling dolphins and determining whether the behavior is concentrated in particular areas of the Great Sandy Marine Park.
Researchers may also investigate which fish species are most commonly associated with shelling and whether seasonal changes in prey abundance influence how often dolphins use the technique.
Drone technology could prove especially useful.
Because shelling often occurs at or near the surface, aerial observation can capture movements that are difficult to see from a boat. Repeated filming could allow scientists to compare individual techniques and identify subtle differences between dolphins.
Genetic and social-network research could then help determine whether dolphins that shell are related, socially connected or simply occupying similar habitats.
A Rare Look at Innovation in the Wild
The discovery of dolphins using shells to catch fish provides more than an entertaining glimpse into unusual wildlife behavior. It offers researchers a practical way to investigate some of the biggest questions in animal cognition.
How do animals invent new behaviors? How do they decide which objects can be useful? How do young animals learn complicated skills? And how can a new behavior spread through a social community?
The answers may emerge as researchers continue studying Queensland’s bottlenose dolphins.
For now, the bottlenose dolphin shelling behavior documented off Hervey Bay stands as a striking example of tool use in the wild. The combination of object manipulation, hunting strategy and possible social learning makes the behavior especially valuable to scientists seeking to understand how intelligence and culture develop beyond humans.
The dolphins’ ability to turn an ordinary shell into a temporary fishing tool also serves as a reminder that the ocean still contains many behavioral discoveries waiting to be documented. As marine researchers spend more time observing wild dolphin communities, other unusual feeding techniques may emerge and reveal just how adaptable these animals can be.
What do you think about dolphins using shells as hunting tools? Share your thoughts in the comments and stay updated for more fascinating discoveries from the world of wildlife and marine science.