explained that killer whales (Orcinus orca) are found in oceans around the world, but they form separate populations - or ‘ecotypes’ - that have their own social structure, food preferences ...

Killer whales, or orcas, are top predators so they absorb all the PCB pollution taken in by the different prey in their food chain - from fish, right up to seals and sharks. The PCBs stunt the ...

Prior research has shown that the southern resident killer whales of the Pacific ... is a lack of access to salmon, the whales' main source of food. But sport fishermen also looking for salmon ...

“These molecules … will stick to fat and aquatic organisms that have a lot of fat in them,” she said in an interview Thursday ...

Sea Lion – Their only natural predators are killer whales and sharks, placing them among the ocean's top hunters. As opportunistic feeders, they eat a wide range of fish, squid, octopus, and smaller ...

PCBs can build up in the marine food chain, affecting dolphins and porpoises. One killer whale found dead off Scotland in 2016 contained among the highest levels of polychlorinated biphenyls ...

adding that chemicals transfer from animal to animal as they move throughout the food chain. Killer whales are particularly vulnerable to heightened toxin levels because they are apex predators.