Another word for killer whale is an orca. Orcas only like fresh meat so they hunt their own. This is a list of what they eat: Fish, seals, sharks, and other whales. Orcas communicate by making clicking and high pitch moaning sounds. Sometimes they just make sounds for fun. Orca whale teeth can grow up to half a footlong! The way how to tell adult females, juveniles(babies, and adult males apart is from the height of the dorsel fins(the pointed thing on whales and sharks). If the fin grows to a limit of 3 feet tall, it's a juvenile or full grown female. If it grows up to 6 feet tall, then it's a adult male.