Over time, that name morphed into "killer whales." Scientists don't know whether orcas kill for fun. The marine mammals do some things, like killing and tossing dead porpoises in the air ...

Killer whales have large, complex brains. They teach hunting techniques to their young, adapt to new prey, and communicate using unique dialects within their pods. Recent incidents show orcas ...

For a deep dive into orca behavior, "Expedition Killer Whale" packs stunning footage into a fascinating hour-long documentary, and we have all the details here on how to watch it. How to watch ...