Marine Biologists Finally Know What Killed 8 Orcas in the Atlantic — It Wasn't a Great White Shark

Photo shown from 00:50 to 00:54: © Jamie Quirke — https://www.instagram.com/Quirke9 --- In more than thirty years of continuous monitoring, not a single calf has ever been recorded in this population. When the catalogue opened, there were ten. Today there are two — both male, both aging, both photographed off the Irish coast in July 2026. They are the last resident killer whales in the waters of Britain and Ireland, and when they are gone, a genetically distinct population and a set of calls made by no other animal on Earth will end with them. Nothing hunted them down to two. In January 2016, a female from the group known as Lulu stranded on the Isle of Tiree. The necropsy that followed found a chemical concentration in her blubber higher than any ever recorded in her species in the Eastern Atlantic — and a genetic result researchers described as unprecedented in any killer whale population anywhere. She had never been pregnant. Four thousand miles away, in Prince William Sound, Alaska, a second population has been running the same clock down since before the Exxon Valdez ever ran aground. Two oceans. No connection between them. The same silent mechanism. This is the story of a collapse with no predator, no attack, and no single day anyone can name. --- SOURCES Brownlow, A., Davison, N. & ten Doeschate, M. (2016). Scottish Marine Animal Stranding Scheme Annual Report 2016. SRUC Wildlife Unit for Marine Scotland, Scottish Government. Case M4/16, Section 5.1, pp. 29–31. https://strandings.org Hebridean Whale and Dolphin Trust — West Coast Community Photo-ID Catalogue. https://www.hwdt.org/west-coast-community-catalogue Jepson, P.D. et al. (2016). PCB pollution continues to impact populations of orcas and other dolphins in European waters. Scientific Reports, 6:18573. Desforges, J-P. et al. (2018). Predicting global killer whale population collapse from PCB pollution. Science, 361(6409), 1373–1376. NOAA Fisheries — Killer Whale (Orcinus orca): AT1 Transient Stock. Marine Mammal Stock Assessment Reports. Designated depleted under the MMPA, 2004. https://www.fisheries.noaa.gov Exxon Valdez Oil Spill Trustee Council — Injured Resources and Services: Killer Whales. https://evostc.state.ak.us