Humpback whale travels 9,300 miles from Australia to Brazil

"A humpback whale has completed the longest ever recorded ocean crossing, making the mammoth journey between Australia and Brazil. Scientists have documented the animal travelling between breeding grounds separated by thousands of miles of open ocean. The individual was first spotted in 2003 in a humpback whale nursery off the Brazilian coast of Bahia. Some 22 years later, in September 2025, it was seen again alone in Hervey Bay off the coast of Queensland in Australia."

"These locations are separated by approximately 9,383 miles (15,100km), making this the longest distance ever documented between sightings of the same individual humpback whale on record. Another individual has also been recorded making the journey in the opposite direction, starting in Harvey Bay in 2007 and turning up off the Brazilian coast of São Paolo in 2019 - a distance of approximately 8,700 miles (14,000km). Experts said the journeys were probably once-in-a-lifetime travel events, rather than a regular migration pattern."

"For the study, a team from the Pacific Whale Foundation and Griffith University compared tens of thousands of photographs of whale tails. Every humpback whale has a unique pattern on the underside of its tail flukes, like a fingerprint, shaped by distinctive pigmentation and scarring. Researchers photograph these tail flukes and build catalogues they can compare across years and regions. The team ran more than 19,000 photographs through an automated image-recognition algorithm."

"Then, they independently verified every potential match by eye, the team found two humpback whales that had been photographed in both regions. 'These whales were photographed decades apart, by different people, in different parts of the world, and yet we can connect their journey,' researcher Stephanie Stack, from Griffith University, said. Finding whales that have switched between pop"

A humpback whale completed the longest recorded ocean crossing between breeding grounds separated by thousands of miles of open ocean. The whale was first spotted in 2003 in a nursery off the Brazilian coast of Bahia. In September 2025, it was seen alone in Hervey Bay off Queensland, Australia, about 9,383 miles (15,100 km) away. A second whale made a reverse journey, starting in Hervey Bay in 2007 and later appearing off São Paulo, Brazil in 2019, covering about 8,700 miles (14,000 km). Experts suggested these trips were likely rare, once-in-a-lifetime events rather than regular migration. Researchers compared tens of thousands of tail-fluke photographs using automated recognition and manual verification, identifying two whales photographed in both regions.

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