how intelligent are they?
Measuring "intelligence" is difficult in them because environment and behavioural strategies are very different from those of humans
Killer whale
They can be trained in captivity and are often described as intelligent, although defining and measuring "intelligence" is difficult in a species whose environment and behavioural strategies are very different from those of humans.
Killer whales imitate others, and seem to deliberately teach skills to their kin. Off the Crozet Islands, mothers push their calves onto the beach, waiting to pull the youngster back if needed.
where does the name killer whale come from UNANSWERABLE how long can these whales live? Wild females average 50 to 80 years and wild males  around 29 years on average, with a maximum of about 60 years does it have other names? Yes, "orca"
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Killer whale [SEP] Intelligence
Alaskan killer whales have not only learned how to steal fish from longlines, but have also overcome a variety of techniques designed to stop them, such as the use of unbaited lines as decoys. Once, fishermen placed their boats several miles apart, taking turns retrieving small amounts of their catch, in the hope that the whales would not have enough time to move between boats to steal the catch as it was being retrieved. A researcher described what happened next: In other anecdotes, researchers describe incidents in which wild killer whales playfully tease humans by repeatedly moving objects the humans are trying to reach, or suddenly start to toss around a chunk of ice after a human throws a snowball.