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Off the coast of South Africa, two killer whales, known as Port and Starboard, have been preying on great white sharks, targeting them with surgical precision to extract their livers. Marine biologists, like Esther Jacobs, have described the scene as a "Hannibal Lecter" style of hunting, as the orcas leave behind the rest of the shark's body after consuming the liver. This behavior has been documented multiple times, with the orcas killing dozens of sharks, including great whites.
The orcas' hunting methods have significant ecological impacts. According to The Washington Post, the disappearance of great white sharks from their usual habitats has led to an increase in populations of their prey, such as Cape fur seals, which has further unbalanced the local ecosystem. This change has also affected the tourism industry, as fewer great white sharks are available for viewing, impacting activities like cage diving.
Alison Towner, a marine biologist at Rhodes University, noted that the orcas' predation on sharks has caused cascading effects throughout the marine ecosystem. The absence of great white sharks has allowed other species to flourish unchecked, leading to what ecologists call a trophic cascade. This phenomenon has even led to increased instances of rabies among seals, as reported by The Guardian.
The orcas' behavior has been confirmed through DNA evidence, as detailed by Divernet. This evidence shows that orcas have been selectively preying on great white sharks for their nutrient-rich livers. The ongoing impact of these predation events highlights the complex interactions within marine ecosystems and the potential consequences of disrupting apex predator populations.