Picture this: you’re a marine biologist floating in a small research boat off the South African coast, scanning the horizon for the telltale spouts of humpback whales. You expect to spot perhaps a handful of these magnificent creatures—maybe a mother with her calf, or a small group of three or four individuals. What you don’t expect is what Dr Gwen Penry witnessed in 2011: a gathering so massive it looked like a whale music festival, with over 200 humpbacks feeding together in an area no larger than a football pitch.
“I’ve been studying whales for twenty years,” says Penry, a marine biologist at Nelson Mandela University, “and I’d never seen anything like it. These weren’t just random encounters—these were organised feeding frenzies happening right where they shouldn’t be.”
What she and her colleagues had stumbled upon would challenge everything we thought we knew about one of the ocean’s most beloved giants. Scientists used to consider groups of 10 to 20 humpbacks “large.” Now they’re witnessing super-groups of 20 to 200 individuals—each weighing about 65,000 pounds—congregating in what can only be described as oceanic flash mobs.
The Mystery Unfolds
For decades, humpback whales have been the poster children of predictable behaviour. Every year, like clockwork, they follow one of nature’s most epic migrations: spending summer months gorging themselves on krill in the icy waters of Antarctica before travelling thousands of miles north to breed in warmer tropical waters. It’s a journey so reliable that whale-watching tours base their entire business model on it.
But something extraordinary has been happening off South Africa’s coast since 2011. Instead of following their ancient migration route south to Antarctica, hundreds of humpbacks have been gathering in what scientists call “super-groups”—massive feeding congregations that appear to be completely rewriting the whale behaviour handbook.
“The world is ending and only the whales know,” jokes marine biologist Sara Chodosh, though her humour masks genuine scientific bewilderment. These whales are hanging out exactly where they shouldn’t be, at precisely the wrong time of year.
“Imagine if you suddenly discovered that every year, thousands of people were abandoning their traditional Christmas destinations to have a massive street party in an entirely unexpected location,” explains Dr Ken Findlay from Cape Peninsula University of Technology, who has been documenting these gatherings. “That’s essentially what these whales are doing.”
A Teenage Whale Hangout?
Perhaps most intriguingly, the majority of super-group participants appear to be young whales. This has led some researchers to wonder whether the South African coast has become something like “the humpback version of the local mall for tween whales,” as one scientist put it. They’re gathering like teenagers at a shopping centre, except instead of looking for a “fishy Orange Julius” or a “krill-based Panda Express,” they’re after something far more substantial.
Because it’s not like 200 whales—each the size of a school bus—can feed just anywhere. Congregations of this magnitude usually indicate parts of the ocean that are extraordinarily productive, with dense concentrations of prey to support such numbers.
A Feeding Frenzy Like No Other
These aren’t social gatherings or chance encounters. The whales are there for one reason: food, and lots of it. And despite their reputation for singing beautiful songs and being friendly to other mammals, let’s not forget that humpback whales are formidable hunters.
“You can smell them before you see them,” says Penry with a laugh. “There’s this distinctive ‘fishy’ odour that comes from whales that have been feeding intensively. It’s like the ocean equivalent of someone who’s just emerged from a fish and chip shop.”
The whales display their most sophisticated hunting behaviour: bubble-net feeding. This remarkable technique involves groups working together like underwater choreographers. Some whales circle below schools of fish whilst others blow streams of bubbles, creating cylindrical walls that confuse and trap their prey. When the trap is set, one whale sounds the call and they all rush upwards simultaneously, mouths agape, engulfing the teeming mass of fish.
It’s rather like an aquatic military operation, except the soldiers weigh 65,000 pounds each and communicate through haunting songs that can be heard 20 miles away.
Not every humpback knows this technique—it’s learned behaviour passed down through whale cultures. Some pods master it, others don’t. It’s the cetacean equivalent of family recipes, passed from generation to generation.
The Antarctic Connection
What makes these super-groups truly puzzling is their timing and location. Southern Hemisphere humpback whales are supposed to be heading to Antarctica for summer feeding when these gatherings occur. Instead, they’re lingering off South Africa, thousands of kilometres from where they should be, feasting on mantis shrimp and local krill species rather than Antarctic krill.
The location itself provides crucial clues. The waters off South Africa’s west coast are part of the Benuela Upwelling System, one of the ocean’s most productive regions. Here, cold, nutrient-rich waters surge up from the depths, creating an underwater Garden of Eden that supports an extraordinary abundance of marine life.
“It’s like discovering a brilliant restaurant in an unexpected location,” explains Findlay. “Once word gets out, everyone wants to try it.”
A Success Story with Consequences
The emergence of these super-groups tells a remarkable conservation success story. Humpback whales were nearly hunted to extinction, with about 90 percent of the world’s population wiped out by commercial whaling. At their lowest point, populations crashed to just 5,000 individuals by the 1960s. Today, thanks to international protection since 1996, their numbers have recovered to approximately 135,000 worldwide—one of conservation’s greatest triumphs.
But success brings its own challenges. With more whales competing for the same Antarctic feeding grounds, some individuals—particularly younger whales—may be forced to seek alternative dining options. It’s the oceanic equivalent of your favourite restaurant becoming so popular that you need to find a new place for Sunday lunch.
“Maybe humpbacks were always this social, and there just weren’t enough of them for us to notice,” suggests Chodosh. It’s entirely possible that these gatherings represent normal behaviour that was simply impossible when populations were devastated by whaling.
The Invisible Ocean
There’s another intriguing possibility: perhaps super-groups have always occurred, but in places we couldn’t see them. If hundreds of whales were gathering in the middle of the Pacific Ocean, we probably wouldn’t spot them, even though their songs can be heard from 20 miles away. As the old philosophical question goes: if a whale sings in the ocean and there’s no one there to hear it, does it still make a sound? (The answer, of course, is absolutely yes.)
Only now, with these gatherings happening relatively close to shore in well-monitored waters, are we witnessing behaviour that may have been occurring for millennia in the vast, unobserved expanses of the open ocean.
Climate Change and Ocean Shifts
The super-group phenomenon may also reflect broader changes in our oceans. Climate change has pushed Antarctic krill populations roughly 440 kilometres further south over the past four decades, potentially making traditional feeding grounds less accessible or productive.
Meanwhile, the South African upwelling system continues to provide reliable feeding opportunities, possibly making it an increasingly attractive alternative to the long journey south.
“The oceans are warming, the seas are rising,” notes Chodosh, “and maybe—just maybe—the whales have had enough.” Perhaps they’re adapting to changing conditions in ways we’re only beginning to understand.
Are They Trying to Tell Us Something?
Some researchers half-jokingly wonder whether these massive gatherings represent a form of communication we’re failing to understand. Like Douglas Adams’ dolphins performing “a double-backward somersault through a hoop whilst whistling the Star Spangled Banner,” perhaps the whales are sending us a message that we’re misinterpreting as merely sophisticated behaviour.
Could these super-groups be the whale equivalent of saying “so long, and thanks for all the krill”? Or are they simply making the most of newly discovered feeding opportunities in a changing ocean?
What This Means for Whales and Us
The super-group phenomenon represents something profound: proof that even well-studied species can surprise us with their adaptability. These whales are essentially demonstrating real-time evolution in action, developing new traditions and behaviours within a single generation.
For whale watchers, this presents extraordinary opportunities. South African whale-watching operators have had to adjust their expectations and schedules to accommodate these unexpected gatherings, often leading to once-in-a-lifetime experiences for visitors.
For scientists, it’s a reminder that the natural world remains wonderfully unpredictable. “This is pretty freakin’ weird,” admits one researcher, and that’s precisely what makes it so fascinating.
The Future of Whale Culture
Perhaps most intriguingly, these feeding strategies appear to be spreading through whale populations via social learning—essentially, whale culture. Humpbacks are known to share feeding techniques through their social networks, much like how they might interact and exchange information with bottlenose dolphins during their travels.
“We’re potentially witnessing the birth of new whale cultures,” suggests Findlay. “These animals are teaching each other new ways to survive and thrive in a changing ocean.”
As climate change continues to reshape marine environments, the adaptability demonstrated by these super-groups may prove crucial for the species’ long-term survival. The whales that first discovered the South African feeding grounds weren’t just finding a new restaurant—they were potentially securing their species’ future.
A Window into Ocean Change
The humpback super-groups serve as a powerful reminder that our oceans are dynamic, ever-changing systems. As we continue to study these remarkable gatherings, we’re not just learning about whale behaviour—we’re gaining insights into how marine ecosystems respond to environmental change.
For now, the super-groups continue to gather each Southern Hemisphere summer, creating spectacular wildlife displays that challenge our understanding of marine life. They’re proof that even in our well-mapped, well-studied world, nature still has the capacity to surprise us.
And perhaps that’s the most wonderful thing about these whale parties—they remind us that the ocean, like life itself, is full of unexpected delights for those willing to look closely enough to see them. Whether they’re teenage whales discovering the equivalent of a cosmic food court, or ancient mariners adapting to a changing world, one thing is certain: these super-groups represent one of the most remarkable wildlife phenomena of our time.
Who knows? Maybe they’re even trying to communicate with a giant space probe. In the mysterious world of whale behaviour, anything seems possible.
Sources:
- Findlay, K. et al. (2017). “Humpback whale ‘super-groups’ – A novel low-latitude feeding behaviour.” PLOS One.
- Penry, G. et al. (2021). “Oceanographic anomalies coinciding with humpback whale super-groups.” Nature Scientific Reports.
- Chodosh, S. (2021). “Humpback whales are organizing in huge numbers, and no one knows why.” Popular Science.
- Griffith University (2021). “What is drawing humpback whale super-groups to the African coast?” Griffith University News.
- Smithsonian Magazine (2017). “Scientists Spot Hundreds of Humpback Whales Feeding in Massive Groups.”
- Good Things Guy (2021). “Humpback Whales Are Thriving! Record-Breaking Numbers in South Africa.”
