Humpback Whale Completes Unprecedented Migration, Surprising Researchers

A humpback whale has undertaken one of the most extensive and uncommon migrations ever documented, which scientists suggest may have been prompted by climate change. The whale was observed in the Pacific Ocean near Colombia in 2017 and subsequently reappeared several years later close to Zanzibar in the Indian Ocean, covering a minimum distance of 13,000 km. Researchers speculate that this remarkable voyage could be attributed to climate change diminishing food supplies or potentially a quest to locate a breeding partner. Ekaterina Kalashnikova, representing the Tanzania Cetaceans Program, described the accomplishment as “truly impressive and unusual even for this highly migratory species”. The same whale was photographed in 2022, off the Zanzibar coast. Dr. Kalashnikova indicated that this was very likely the longest distance a humpback whale had ever been recorded travelling. Humpback whales inhabit all global oceans. Annually, they undertake extensive journeys, possessing one of the longest migratory patterns among all mammals, moving from tropical breeding areas to feeding zones in cooler waters. However, this particular male’s voyage proved even more remarkable, encompassing two geographically separated breeding grounds. A hypothesis suggests that climate change is modifying the availability of the tiny, shrimplike krill that humpback whales consume, compelling them to seek sustenance over greater distances. Alternatively, whales might be investigating novel breeding locations as their populations recover due to global conservation initiatives. “While actual reasons are unknown, amongst the drivers there might be global changes in the climate, extreme environmental events (that are more frequent nowadays), and evolutionary mechanisms of the species,” stated Dr. Kalashnikova. This migratory male was part of a pod of humpbacks captured in images from a research vessel on the Pacific coast of Colombia in 2013. He was subsequently recognized in a comparable region in 2017 and off Zanzibar in 2022. These observations are demarcated by a 13,046 km great-circle distance, which scientists state represents the minimum distance for the route the whale might have taken, although the actual distance covered is probably considerably longer. Given that Earth is spherical, the most direct route between any two locations is defined by the great circle distance, which forms an arc connecting two points on a sphere. The conclusions of the study derive from hundreds of thousands of whale photographs contributed by researchers, whale watchers, and members of the public to the citizen science website, happywhale.com. The database utilizes artificial intelligence to identify unique contours and markings of humpback whale tails, or flukes, thus charting their global travels. The investigation appeared in the journal, Royal Society Open Science.