Orcas—also known as killer whales—typically have specialized diets, often feeding on a single prey species. Some populations rely almost entirely on a particular fish, such as salmon or herring. Others hunt marine mammals. But Iceland’s orcas aren’t like the rest. Here, some chow on herring, while others switch between fish and marine mammals, feeding across multiple levels of the food chain. Since 2008, scientists have been working to understand why—and what these dietary patterns mean for the whales' health, reproduction and survival over time. Join one of the first long-term studies of killer whale diets as you track these apex predators. From cliffside lookouts and small research vessels, document where orcas go, how they hunt, what they eat, and how those choices affect their health and survival. Against Iceland’s rugged coastal landscapes, get a front-row view on how a top predator adapts.