PERTH, Australia – September 30, 2026 – A huge humpback whale washed ashore at one of Perth’s most popular beaches this week, turning a familiar stretch of Western Australian coastline into an unusual scene of wildlife, crowds, heavy machinery and sharks.
The approximately 13-metre (43-foot), 31-tonne humpback whale was found at City Beach early Monday morning. By the time it reached the shoreline, the animal was already dead.
Authorities have not established a definitive cause of death, but the condition of the carcass suggested that the whale may have been weakened or unwell before it died at sea.
The enormous carcass quickly attracted hundreds of curious onlookers. But the spectacle also created an immediate safety problem: large sharks began gathering close to the beach.
At least two white sharks, estimated at around four and five metres long, were reported only about 10 metres offshore. Other sharks were also seen in the area, prompting authorities to close City Beach and issue repeated shark warnings.
For Perth residents accustomed to seeing humpback whales migrating along the Western Australian coast, the whale itself was not necessarily the extraordinary part.
The extraordinary part was finding one of these enormous animals lying dead on a busy urban beach – and then watching the ocean around it become a feeding ground for predators.
A Difficult 31-Tonne Problem
Removing a dead whale is far more complicated than simply towing a large object away. The Town of Cambridge and state authorities faced the task of dealing with a carcass weighing roughly 31 tonnes, while keeping people away from an area where sharks were already active.
Authorities planned to use heavy machinery and specialist equipment to remove the whale. The operation was described by local officials as complex and potentially hazardous. The carcass was ultimately to be transported for disposal rather than simply left on the beach.
There was another complication. Even after the carcass itself was removed, material released into the water could continue to attract sharks.
One marine scientist warned that the scent and organic material associated with such a large carcass could remain an attractant for some time. That meant reopening the beach was not simply a matter of moving the whale.
Why Do Humpback Whales Pass Perth?
The presence of a humpback whale off Perth is far from unusual. Humpback whales (Megaptera novaeangliae) undertake one of the great migrations of the animal kingdom.
They spend the warmer months feeding in productive, cold waters at higher latitudes and migrate toward warmer tropical waters to breed and give birth. Western Australia is part of one of these major migration routes.
Research involving satellite tracking has shown that humpback whales migrating along the Western Australian coast travel between tropical breeding grounds and feeding areas in the Southern Ocean. Some of the population’s important feeding grounds lie around the southern Kerguelen Plateau.
The whales therefore pass the Western Australian coastline as part of a seasonal journey stretching thousands of kilometres.
For much of the year, they are associated with open ocean. During migration, however, they can come remarkably close to shore, making sightings possible from beaches and coastal headlands.
A Giant That Lives on Tiny Prey
Despite their enormous size, humpback whales do not hunt large marine animals. They are baleen whales, feeding primarily on small organisms such as krill and small schooling fish.
Instead of teeth, they have baleen plates that allow them to filter food from huge volumes of seawater.
Their feeding behaviour can be spectacular. Some humpbacks use bubble-net feeding, producing rings or curtains of bubbles that help concentrate schools of fish before the whales surge upward with their mouths open.
In the Southern Hemisphere, Antarctic krill are particularly important to their diet. The whales spend much of their time building up energy reserves in the cold, productive waters of the Southern Ocean before beginning their migration north.
Recent research has also challenged the old idea that migrating humpbacks simply stop eating once they leave Antarctica. Australian research has found evidence that whales can make feeding stops during their migration, particularly on their southbound journey.
Do Sharks Attack Humpback Whales?
The gathering of sharks at City Beach raises an obvious question: Would a great white attack a living humpback whale? The answer is more complicated than a simple yes or no.
Great white sharks are known to feed on whale carcasses. The Western Australian Museum notes that white sharks are commonly observed feeding on dead whales and may preferentially consume the energy-rich blubber.
A dead whale is therefore an enormous, highly concentrated food source. Live humpback whales are a different proposition.
A healthy adult humpback can be more than 15 metres long and weigh more than 30 tonnes. A fully grown animal is an extremely difficult and dangerous target for a shark.
Evidence suggests that sharks are much more likely to scavenge large whale carcasses than to actively hunt healthy adult humpbacks. But sharks can attack vulnerable whales.
A study of humpback whales off Western Australia documented shark interactions involving calves and reported an apparent white-shark attack on a humpback calf.
The researchers also documented numerous sharks gathering around humpback carcasses following predation events.
There are also documented cases of large sharks attacking weakened or compromised humpback whales.
In other words, size alone does not make a whale immune to predation – but a healthy adult humpback is a very different target from a calf, an injured animal or a carcass.
For humpback calves, another predator is particularly important: killer whales, or orcas. Research off Western Australia has documented repeated attacks by killer whales on newborn humpback calves. In one study, 22 attacks with known outcomes resulted in at least 14 calf deaths.
This is one reason mothers and other adult humpbacks may respond aggressively when predators approach a calf.
Why the Sharks Came So Close to City Beach
The sharks seen near Perth were not necessarily there because they were hunting people. They were responding to a much more basic ecological opportunity: a huge amount of dead animal tissue in the water.
White sharks have extremely sensitive sensory systems and can detect chemical cues associated with prey. Once a large whale dies, its carcass can become a temporary but substantial food resource for a variety of marine scavengers.
That is exactly what made the City Beach incident so unusual for people watching from shore. A whale carcass that would normally become part of an offshore marine ecosystem had instead ended up only metres from one of Perth’s busiest beaches.
The result was a rare collision between two worlds: a natural marine food chain and an urban beach.
More Than a Rare Sight
The City Beach whale became a social-media sensation because of its sheer size and because people could see something normally hidden from view – the aftermath of a whale’s death in the ocean.
But the event also demonstrated why authorities reacted quickly. A 31-tonne carcass can attract predators, create navigation and environmental problems, and pose risks to people who approach it.
Authorities reported that some members of the public came extremely close to the animal, with at least one person even sitting on the carcass, despite warnings to stay away.
For marine scientists, however, even an unfortunate event such as this can provide valuable information.
Biological samples taken from dead whales can help researchers investigate their health, diet, reproductive status and possible causes of mortality.
And for everyone watching from the beach, the scene offered a striking reminder that Perth’s coastline is not merely a recreational space.
It is part of a vast migratory highway used by some of the largest animals on Earth.
Every year, humpback whales travel thousands of kilometres between the cold feeding grounds of the Southern Ocean and warmer breeding waters farther north. Most pass through without incident.
This one ended its journey on a city beach – where, for a few days, its enormous presence brought the hidden world of the ocean remarkably close to shore.
Sources:
- ABC News Australia – reporting on the City Beach carcass, shark activity, tagging operation and removal plans. (ABC News)
- Department of Primary Industries and Regional Development, Western Australia (DPIRD) – information on humpback migration monitoring and whale movements along the WA coast. (dpird.wa.gov.au)
- Australian Museum – species information, size, distribution, diet and migration of humpback whales. (The Australian Museum)
- NOAA Fisheries – global distribution, migration, feeding behaviour and biology of humpback whales. (NOAA Fisheries)
- Western Australian Museum – white shark biology and their documented scavenging of whale carcasses. (Western Australian Museum)
- Marine Mammal Science / NOAA – scientific research on killer whale and shark interactions with humpback calves off Western Australia. (DOI)
- Scientific Reports / DPIRD — satellite-tracking research identifying important feeding grounds for Western Australian humpback whales in the Southern Ocean. (DPIRD Library)
- (The West Australian)
- (The Australian Museum)
