Killer whales sink another boat off the coast of Spain — why are they still doing this after 6 years? Researchers have identified roughly 15 individual killer whales involved in these incidents, out of an Iberian subpopulation of fewer than 50. The ‘Killer Whale’. The Killer Whale is a very intelligent creature that prefers to hunt, rather than be hunted. To: BenLurkinKiller whales sink another boat off the coast of Spain — why are they still doing this after 6 years?