An orca whale is a marine mammal. It can weigh upto 10 tons. Orcas are also known as killer whales. The word killerwhale can make you afraid to go on that swimming trip that you andyour dad planned at the beach, but scientists have been studyingthese animals for over twenty years and there has not been onedocumented case of a killer whale harming a human. This web site isdedicated to orca whales and the students who want to learn moreabout them. So dive into tons of facts. Then after you're done youjust might want to go on that swimming trip.