The Orca An orca is black and white. It can grow up to 30 feet long. An orca’s fin can be 6 feet tall. Orcas are large dolphins, but they are often called “killer whales.” A baby orca is called a calf. Orcas take good care of their babies. As soon as a calf is born, its mother pushes it up to get some air. A group of orcas is called a pod. The pod looks for fish to eat. The orca catches fish with its sharp teeth. One orca can eat over 100 pounds of food in a day. Orcas are sometimes called “wolves of the sea” because they hunt in packs like wolves.