Two severed killer whale fins discovered on a remote Russian island may reveal a shocking new behavior: killer whales may be hunting and consuming their own species. Each fin is newly severed, and a recent study indicates that the tooth marks belong to another killer whale.
Dr. Olga Filatova, an associate professor at the University of Southern Denmark, received the alarming photographs from her collaborator, Sergei Fomin, and was certain about the implications.
“I was astonished when he discovered the first fin,” she stated in an interview with BBC Science Focus. “We never believed we would witness this phenomenon in our lifetime, but it appears we have.”
Genetic analysis confirmed that the severed fins belonged to resident killer whales, which are fish-eating mammals living in tight family groups for generations. The likely aggressor is the transient killer whale, a separate population that preys on marine mammals such as seals, sea lions, and other whales.
From a taxonomic perspective, all killer whales belong to a single species, meaning this behavior technically qualifies as cannibalism. Killer whale.
However, Filatova emphasizes that the situation is more nuanced. Resident and transient populations do not socialize or interbreed, and in the wild, they may not even recognize one another as the same species.
Filatova suggests that the attack likely occurred during a large social gathering, where numerous resident families convened for breeding. Due to the familial ties within these groups, killer whales must seek mates from outside their family units, resulting in fragmented populations that may extend over several kilometers.
During these social events, young males may become separated from their protective family units. “This provides an opportunity for mammal-eating species to target these vulnerable young, as other adults are preoccupied,” Filatova explained.
Fomin observed one such gathering shortly before he came across the second fin.
Both fins belonged to young whales, and their severed state—rather than being simply bitten off—suggests that killer whales that hunt other species typically remove fins to access the flesh beneath, leaving low-energy remains.
This discovery carries implications beyond the immediate tragedy. Filatova posits that the strong social bonds characteristic of resident killer whale communities could stem from the pressures of predation.
“These populations remain stable for a specific reason: they need to safeguard themselves,” she remarked.
She theorizes that the two populations first encountered each other around 100,000 years ago when resident whales—more genetically similar to Atlantic killer whales—migrated to the North Pacific, encroaching on territory already inhabited by transients.
The remarkable family cohesion seen in today’s killer whales may be a result of evolving under the long-term threat of predation.
With only two fins discovered thus far, Filatova is cautious about drawing definitive conclusions. It remains uncertain whether this killing behavior signifies a recent shift or if it has been occurring unnoticed.
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Source: www.sciencefocus.com
