She and collaborators Sergey Fomin and Ivan Fedutin argue the most likely scenario is a mammal-hunting group targeting a fish-eating group, a pattern that could help explain why some orca families stay so tightly knit. \u201cAlso, if it was just aggression, they wouldn\u2019t bother to tear off the fin,\u201d Filatova said.<\/p>\n\n\n\n
Two fins, one pattern<\/h2>\n\n\n\n
One severed fin was found in 2022, and a second, similar fin turned up in 2024 about 1.2 miles away on the same island. The 2022 fin was about 19 inches tall, the 2024 fin was about 28 inches tall, and both showed tooth marks<\/a> consistent with another orca. <\/p>\n\n\n\n It is only two finds, but the near-repeat is exactly what made the researchers suspect a pattern instead of a fluke.<\/p>\n\n\n\n The case is built on physical remains and photos, which is common in ocean science where direct observations can be rare. In their peer-reviewed write-up, the authors frame the event as predation by mammal-eating Bigg\u2019s killer whales on \u201cresident\u201d fish-eaters, and the publication record lists it as released in April 2026. So what does that tell us about how these whales live side by side?<\/p>\n\n\n\n The biggest uncertainty is timing. The researchers say they cannot rule out scavenging, meaning the whales might have been dead before another orca fed on them, but they note dead killer whales usually sink quickly and become hard to reach. They also argue the damage is unlikely to come from \u201cmere\u201d aggression, since tearing off a fin takes effort and provides little payoff unless feeding is involved.<\/p>\n\n\n\n The word \u201ccannibalism\u201d can sound like a blanket label, but this story is narrower than that. The researchers describe a likely one-way hunting relationship between groups that share water yet do not behave like a single community. For humans, it is shocking, but for the whales it may function more like predator and prey<\/a>.<\/p>\n\n\n\n Scientists often describe North Pacific killer whales as \u201cecotypes,\u201d which is a jargon-laden way of saying groups that look similar but have different lifestyles. NOAA Fisheries<\/a> says there are three main regional types, and two of the best known are residents that mostly eat fish and transients, also called Bigg\u2019s killer whales, that mainly hunt marine mammals<\/a> like seals, sea lions, porpoises, and other whales. <\/p>\n\n\n\n The same source notes these types are not known to interbreed, even when they share parts of the same ocean.<\/p>\n\n\n\n Genetic work backs up that separation. A 2018 Journal of Heredity<\/em> study<\/a> described resident and transient killer whales as ecotypes that differ in ecology and behavior and do not interbreed, using samples from the western North Pacific. That kind of long-term split is the backdrop for why one group might not treat the other as \u201ctheir own.\u201d<\/p>\n\n\n\n The new paper\u2019s most interesting claim is not just that killer whales might eat other killer whales. It is the suggestion that predation pressure can shape social life, nudging residents toward extremely stable family groups where relatives protect each other. Anyone who has ever felt safer walking in a group gets the basic idea.<\/p>\n\n\n\n There is a catch, though. Residents sometimes spread out during gatherings that create mating opportunities outside their closest relatives, and that spacing could increase risk in the moment. The ocean is huge, but safety can still come down to who is close enough to respond fast.<\/p>\n\n\n\n This case also lands in the middle of a larger debate about whether \u201cresident\u201d and \u201cBigg\u2019s\u201d should be treated as separate species. A 2024 feature story<\/a> reviewing genetic, physical, and behavioral evidence argued the case for a split, while noting the Society of Marine Mammalogy has so far stopped short of fully adopting species status. In other words, the science is moving, but the labels are still catching up.<\/p>\n\n\n\n A separate 2024 paper archived in a U.S. government research repository argued that formal taxonomy guidelines support species-level status for the two ecotypes. That does not automatically rewrite textbooks, but it shows how quickly the conversation has shifted from hunting styles to evolution in action.<\/p>\n\n\n\n Right now, the evidence is vivid but limited, and the researchers themselves describe it as observational. Future work could include genetic sampling of stranded remains, photo identification, and tagging studies that track where different groups travel<\/a> and when they overlap. Those methods can turn a graphic clue into a clearer map of risk.<\/p>\n\n\n\n Funding is part of the story, too. The team notes support from the Human Frontier Science Program<\/a>, which backs international projects aimed at fundamental questions about how living systems work. If more remains are found, researchers will be able to test whether this was a rare event or a repeating pressure in that ecosystem.<\/p>\n\n\n\n The main study has been published in Marine Mammal Science<\/em><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" A dorsal fin is the part of an orca you usually see first, slicing the surface like a moving flag. … <\/p>\nWhy the bites matter<\/h2>\n\n\n\n
Read More: A quote attributed to Robert Frost has been circulating in offices around the world for decades and remains unsettling for one reason: his explanation of when the brain stops thinking has lost none of its power<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
![\"Severed](\"https:\/\/www.ecoticias.com\/en\/wp-content\/uploads\/2026\/04\/orca-dorsal-fin-bering-island-russia-study.jpg\" "\\"\\"")
Two types of orca neighbors<\/h2>\n\n\n\n
Read More: The new threat that worries scientists does not come from Earth, but from the Sun, and could affect satellites, GPS, and communications<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
Safety in numbers<\/h2>\n\n\n\n
A species debate in motion<\/h2>\n\n\n\n
Read More: The 5,200 holes dug into a mountain in Peru are no longer a mystery, and the explanation changes what we knew about their ancient economy<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
What comes next<\/h2>\n\n\n\n