Orcas are attacking ships again. Here’s a history of the practice

A pod of killer whales attacked and sunk a yacht over the weekend between Spain and Morocco in the Strait of Gibraltar — and it’s not the first time.

The couple on the yacht said they felt sudden blows to the hull and rudder before the boat started taking on water, according to reports. They alerted authorities and a nearby oil tanker took them onboard. The yacht was unsalvageable.

Sunday’s incident is the latest in a string of attacks on yachts by orcas in recent years. A lot regarding the attacks remains a mystery to experts...