Sea lions swam for their lives as a pod of killer whales chased them on B.C.'s North Coast in a new video uploaded to YouTube. <br /> <br />The footage, posted by Travis Twizell, was shot on Wednesday near Prince Rupert and shows the sea lions trying to use a boat as protection from their mammal hunters. But in the end, it appears the whales succeed in killing at least one of their prey. <br /> <br /> Resident orcas who eat salmon, live in larger groups, and travel over small distances. <br /> Biggs orcas, or transients, who hunt marine mammals, live in smaller groups, travel greater distances. <br /> Offshore orcas, who are thought to eat fish and sharks, and live 15 kilometres or more from shore. <br /> <br />The Prince Rupert video is the latest in a string of dramatic whale encounters in B.C. over the past two weeks. <br /> <br />Earlier this month, a pod of orcas were spotted chasing dolphins in Squamish. Then, pods of Pacific white-sided dolphins surprised people in Vancouver's English Bay.