record-breaking humpback – Researchers used nearly 20,000 whale-tail photographs and automated image recognition to identify two humpback whales that traveled record-breaking distances between eastern Australia and Brazil’s breeding grounds—about 8,823 miles in one case and about 9,383
For one humpback whale, the trail starts in Queensland in 2007. Years later, the same animal reappears near São Paulo, Brazil, in 2019—an ocean-crossing distance of about 8,823 miles that researchers say is the greatest ever recorded between two sightings of the same humpback whale.
In a second match, the timeline runs the other direction. This whale was seen off Bahia in Brazil, then identified 22 years later in Hervey Bay, Australia—roughly 9,383 miles across seas. In both cases, the “proof” doesn’t come from tracking tags or satellite telemetry. It comes from photographs of whale tales—and the painstaking way those images can be matched back to the same individuals.
The study. published in Royal Society Open Science on Wednesday. finds that these two whales made what researchers describe as the longest-known distances ever seen between two pictures of the same humpback whale. The work. by an international team of scientists. relied on tens of thousands of images taken from the eastern shores of Australia and the breeding grounds of Brazil. Using an automated image-recognition algorithm, the researchers identified two humpback whales that had been photographed in both regions.
To build the dataset. the team drew on nearly 20. 000 photographs collected between 1984 and 2025 from eastern Australia and Latin America. contributed by both scientists and citizen scientists. The key is that humpback tails carry distinctive markings—enough to let computer systems and researchers link images taken years apart to the same animals.
“Despite their rarity. these exchanges matter for the long-term health of whale populations. ” said Stephanie Stack. a Griffith University PhD researcher and report co-author. She added that occasional individuals moving between distant breeding grounds can help maintain genetic diversity across populations.
Stack also pointed to a cultural mechanism humpbacks are known for. She said such whales “may even carry new song styles from one region to another,” noting that humpback whale songs spread culturally across ocean basins, much like music trends in human populations.
The record is extraordinary, but the researchers’ framing is about something more than a travel brag. The findings lend further credence to a theory called the “Southern Ocean Exchange.” The hypothesis suggests humpback whales sometimes travel to feeding grounds in the Antarctic and then take a different journey home—ending up in a completely new breeding area.
Griffith University ties potential shifts in that pattern to the climate. Climate-driven changes to the Southern Ocean, including shifts in sea ice and the distribution of Antarctic krill—the whales’ main prey—may be making such crossings more likely over time.
There is a stark backdrop to why this matters now. Due primarily to commercial whaling, humpback whales were listed as endangered in the U.S. in the 1970s, according to NOAA. A final moratorium on commercial whaling was established in 1985. NOAA says today that four of the 14 distinct population segments are still protected as endangered. and one is listed as threatened.
The study also landed with a reminder that the science isn’t only happening in labs and research vessels. The approach depended on the participation of public observers. “This kind of research highlights the value of citizen science,” said Dr. Cristina Castro of Pacific Whale Foundation in a statement. “Every photo contributes to our understanding of whale biology and. in this case. helped uncover one of the most extreme movements ever recorded.”.
Taken together, the photographs stitched across continents don’t just rewrite what these two whales are capable of. They show how—and sometimes how rarely—new connections form between breeding populations that have been shaped by a long history of human pressure and conservation measures.
humpback whales record distance Brazil Australia whale tails citizen science Royal Society Open Science Southern Ocean Exchange krill Griffith University NOAA