OCEAN · FIELD GUIDE
The Record Humpback — The Whale Who Crossed From the Pacific to the Indian Ocean
Humpback whales swim some of the longest migrations on Earth — but they almost always travel north-and-south, between cold feeding seas and warm breeding bays, and they return faithfully to the same ocean. So how did one adult male turn up on the far side of the planet, an entire ocean away from where he was first seen? No one tracked his route. We only know he was, somehow, in two places 13,046 km apart.
A whale in the wrong ocean
Humpback whales are built for long journeys. Most of them migrate thousands of kilometres each year between cold polar feeding grounds and warm tropical breeding bays — but almost always in a straight north-south line, and almost always returning to the same ocean their population has used for generations. East-west wandering between ocean basins is, in the words of the scientists who study them, atypical.
Which is why one adult male humpback caused such surprise. He was first photographed off the Gulf of Tribugá, on Colombia's Pacific coast, on 10 July 2013, swimming in a rowdy competitive group of seven whales. He was seen again nearby, off Bahía Solano, in 2017 — exactly where a Pacific-breeding humpback should be. And then, in 2022, he turned up on the other side of the world.
Recognised by his tail
No one had put a tag on him. Instead, he was identified the way a growing number of whales now are — by his fluke. The underside of a humpback's tail is patterned with pigment, ridges and scars unique to each animal, stable for life, and as recognisable as a fingerprint. Photographs of those markings are uploaded to Happywhale, a citizen-science platform where image-recognition software and trained reviewers match the same whale across years and continents.
When his Colombian fluke was compared against the global catalogue, it matched a whale photographed off Fumba, in the Zanzibar Channel of Tanzania, on 22 August 2022 — once again in a competitive group, this time in the southwest Indian Ocean.
13,046 kilometres apart
His two breeding grounds — off Colombia and off Zanzibar — lie 13,046 km and 120 degrees of longitude apart. That is the longest distance ever documented between sightings of a single humpback whale, and the first record of any humpback switching breeding grounds between the Pacific and Indian Oceans.
We have to be careful, and the map is too: 13,046 km is the straight-line distance between where he was seen, not the distance he swam. His actual route was never recorded. He may well have travelled much farther — the study suggests he likely looped south toward the krill-rich feeding waters near South Georgia and the Antarctic Peninsula before heading up the coast of Africa. So on this map his whole path is drawn as a dashed, best-guess line, with solid glowing points only where he was truly photographed. The blank in between is the honest part.
Why his journey matters
Even without a recorded route, this whale changed what scientists thought possible:
- Oceans aren't walls. He is the first humpback known to move between the Pacific and Indian Ocean breeding populations — groups long assumed to stay separate.
- A face can cross a planet. His story shows the power of photo-ID and citizen science: a tail photographed by different people, years and oceans apart, can reveal a journey no tag was there to record.
- Honesty is part of the science. His dashed line is a reminder that good data means being clear about its limits — we know where he was twice, and we are honest that we do not know the path between.
See it on the map
Switch on the Animal Journeys layer on the Ocean canvas to find his track. Unlike the others, his line is dashed end to end — because none of it was recorded — looping south through the Southern Ocean as a best guess, with solid waypoints off Colombia and at Zanzibar where he was really seen. He travels alongside Nicole the great white and Adelita the loggerhead turtle, three real animals whose journeys are each drawn, as honestly as the science allows, from published and citable studies.
Source: Kalashnikova, E., et al., "Interbreeding area movement of an adult humpback whale between the east Pacific Ocean and southwest Indian Ocean," Royal Society Open Science (2024). DOI: 10.1098/rsos.241361.
Frequently asked questions
What is the record this humpback whale set?
He holds the record for the longest distance ever documented between sightings of a single humpback whale: 13,046 km, across 120 degrees of longitude, between breeding grounds off Colombia (eastern South Pacific) and off Zanzibar, Tanzania (southwest Indian Ocean). He is also the first humpback ever known to move between the Pacific and Indian Ocean breeding populations (Kalashnikova et al., Royal Society Open Science, 2024).
How was he identified if he was never tagged?
By his tail. Every humpback's fluke — the underside of its tail — carries a unique pattern of pigment, scars and markings, as individual as a human fingerprint. Photographs of his fluke taken off Colombia in 2013 and 2017, and off Zanzibar in 2022, were matched on the citizen-science platform Happywhale, which uses image-recognition software and trained reviewers to confirm the same individual across time and distance.
Is the line on the map the route he actually swam?
No — and that is the honest heart of his story. He was never carried a satellite tag, so his real path was never recorded. The 13,046 km figure is the great-circle distance (the shortest line over the curve of the Earth) between his two confirmed breeding grounds, not the distance he travelled. That is why his entire track is drawn dashed and flagged as not a recorded route, with solid waypoints only at the places he was actually photographed.
Why does the line dip down toward Antarctica?
Because that is the researchers' best guess, and the map shows it as a guess. Humpbacks feed in the cold, krill-rich waters of the far south, so the study suggests he may well have looped down toward South Georgia and the Antarctic Peninsula — feeding grounds used by his Pacific population — before turning north for Africa. The dashed southern loop is a plausible route consistent with what humpbacks do, not a measured one.
Why would a whale travel so far between oceans?
No one knows for certain. The study's authors note that males tend to roam more between breeding grounds, driven by competition to mate, so he may have been seeking better odds with females elsewhere. Other possible factors include shifting krill and changing ocean conditions pushing whales to explore new breeding and feeding areas. His journey is rare enough — possibly a once-in-a-lifetime event — that its cause can only be reasoned about, not proven.
Why include a whale whose route we don't even know?
Because honesty about what we do and don't know is the point of this layer. Nicole the shark gives us a recorded crossing and an inferred return; Adelita the turtle gives us a fully recorded ocean crossing; this humpback gives us the third case — two certain points and an honest blank in between. Together they show the real texture of how animals are tracked: sometimes by tag, sometimes only by a face we recognise an ocean later.
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