Two humpback whales spotted off the coast of Brazil were originally seen near Australia, making their journey the longest lifetime migration ever recorded for the species. One of the whales traveled more than 13,000 kilometers across the Southern Ocean before being photographed again on the other side of the South Atlantic.
A whale of a commute across two oceans
Researchers identified the whales by matching photographs of their tail patterns, which are as unique as human fingerprints. The first whale was photographed off the coast of Australia in 2003. More than two decades later, the same individual was spotted near Brazil in 2024. The second whale was seen off Australia in 2001 and again off Brazil in 2023. Both animals were male, and both had made the crossing from the Pacific side of the Southern Ocean to the Atlantic side.
Why local scientists and fishermen took notice
The discovery was made by a team of researchers from Australia, Brazil, and the United States. They published their findings in a marine biology journal. The whales were not tagged with tracking devices. Instead, researchers relied on citizen scientists and whale watching operators who shared photographs of the animals. Local fishing communities in Brazil and Australia have long reported seeing humpbacks in their waters, but no one expected the same individuals to appear on both sides of the continent.
Humpback whales are known for long migrations, usually between cold feeding grounds and warm breeding areas. But this journey is far longer than the typical route. The researchers said the whales likely swam around the southern tip of South America, passing near Antarctica, to reach Brazil. That path adds thousands of kilometers to the usual migration distance.
This record crossing shows that humpback whales are capable of traveling farther than scientists previously thought. It also raises questions about how these animals navigate across entire ocean basins without getting lost. The researchers noted that climate change may be shifting the whales' food sources, which could push them to explore new routes. But they did not confirm a direct link between the record journey and warming waters.
The findings give marine biologists a rare look at the full range of movement for a single whale over its lifetime. For people in coastal towns in Australia and Brazil, the news turned a familiar sight into something extraordinary. The same whale that splashed near a beach in Queensland may have been seen years later by fishermen off the coast of Bahia.
