Australia

Humpback Whales Break Record With Ocean Crossing

Are record-breaking whale migrations a sign of hope or a distraction from the climate crisis threatening their survival?

Published MAY 20

Humpback Whales Break Record With Ocean Crossing

Story

Above: Humpback whales swim in the waters of Stellwagen Bank National Marine Sanctuary off the coast of Massachusetts on May 19. Image credit: Joseph Prezioso/Anadolu/Getty Images

The Facts

In their findings published in the journal Royal Society Open Science on Wednesday, scientists have confirmed two humpback whales made separate record-breaking crossings between breeding grounds in eastern Australia and Brazil, with the longest journey spanning 15,100 km (9,383 miles) — the greatest distance ever documented between sightings of an individual humpback whale.
Dw.Com
Daily Mail
CBS News
One whale was first photographed at Brazil's Abrolhos Bank in 2003 and spotted again in Hervey Bay, Australia, in September 2025. The other was first seen in Hervey Bay in 2007 and later photographed off São Paulo, Brazil, in 2019, a minimum straight-line distance of about 14,200 km.
Newsreel Australia
PHYS
The Straits Times
The study drew on 19,283 fluke photographs collected between 1984 and 2025 from eastern Australia and Latin America, contributed by researchers and citizen scientists via the global tracking platform Happywhale. Automated image recognition software was used, with every potential match independently verified by eye.
Namoi Valley Independent
ScienceDaily
New York Post
Across more than four decades of data covering nearly 20,000 identified humpback whales, only two individuals were found to have traveled between the two breeding regions, representing just 0.01% of whales in the records. Researchers described the crossings as rare, possibly single-lifetime events.
Royal Society Publishing
Daily Mail
Independent
Researchers said occasional movements between distant breeding grounds can help maintain genetic diversity and may carry new song styles between populations. The findings support the "Southern Ocean Exchange" hypothesis, which proposes that whales from different populations may meet on shared Antarctic feeding grounds.
Dw.Com
PHYS
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The Spin

Narrative A

These crossings support the Southern Ocean Exchange hypothesis, showing whales sometimes end up in entirely new breeding grounds after Antarctic feeding. This kind of genetic and cultural mixing across ocean basins is vital for long-term population health. The discovery proves that marine life is more resilient, adaptable and interconnected than previously believed. The whales' endurance also offers hope that populations can recover despite the stress of warming seas.

Griffith University

The New Daily

Narrative B

Record-breaking migrations mean little if climate change keeps dismantling the breeding grounds whales depend on. Rising ocean temperatures could render 67% of humpback breeding areas uninhabitable by the century's end, and krill populations — the backbone of whale nutrition — have already collapsed by roughly 80% since the 1970s. Celebrating whale endurance while ignoring these threats misses the bigger, far more urgent picture.

NOAA