Killer whales get their name because of what they eat. Other sea creatures are on the menu all the time. According to SeaWorld, killer whales eat everything from fish to other whales, walruses and even sea otters.
In this case, these orcas are hunting a sea otter mother and baby. One whale nabs the baby, but the mother escapes by jumping onto a boat. You can see some beautiful shots of the hunting whales circling the craft and the mother as she climbs onto the deck to escape.