High Concentrations of Unidentified Extractable Organofluorine Observed in Blubber from a Greenland Killer Whale (Orcinus orca) | Environmental Science & Technology Letters
Another endangered killer whale is losing weight, but several believed to be pregnant | CBC News
Facts about orcas (killer whales) - Whale & Dolphin Conservation USA
Orcas (Killer Whales): Facts and Information
The animal from which great whites flee: 5 killer records held by orcas | Guinness World Records
False Killer Whale | NOAA Fisheries
Killer Whale | Whale Watching Handbook
Orca guide: diet, how they hunt, and what they're related to | Discover Wildlife