There are Resident orcas which are the most commonly seen in the Pacific East. They travel in strong, cohesive family pods and eat mainly fish but on occasion squid. They are creatures of habit and visit the same locations continuously.
The next are Transient and their distinctive quality is their diet, they eat mainly marine mammals, such as sea lions and sometimes they even feed on other whales. They travel in smaller groups from about 2 to 6 and they don't have such strong, persistent family bonds as other species of orca. They are also referred to as Biggs killer whale (because of Michael Bigg who discovered them) which is beginning to replace the transient label they currently have.