What are ‘Gladis’ orcas and why are they attacking yachts in the Strait of Gibraltar?

The Strait of Gibraltar has become a hotspot for unusual encounters between orcas, also known as killer whales, and yachts. A specific pod, nicknamed the “Gladys” orcas, has been linked to several incidents since 2020, baffling marine experts.

The killer whales have been butting heads with fishing boats, tearing propellors and scaring seamen. These orcas target smaller vessels, ramming them and causing damage that can lead to sinking. The 49ft long Alboran Cognac is their latest victim.

What is the “Gladis” pod and why are they special?

The “Gladys” pod refers to a group of roughly 15 orcas out of a larger population of 37 inhabiting the area between the northern tip of the Iberian Peninsula and the Strait itself. While orcas are known for their intelligence, these attacks deviate from their typical hunting behavior.

Theories abound for this perplexing behavior. Some suggest the orcas might be targeting the boats out of curiosity or play. Another theory points to a potential “revenge” motive. Experts believe a specific orca named “White Gladis” might have had a negative encounter with a vessel in the past, leading to its aggressive behavior. This behavior could then be imitated by other members of the pod, a form of learned behavior.

Researchers are actively studying the “Gladys” orcas to understand their motivations. The Groupo Trabajo Orca Atlantica (Atlantic Orca Working Group) even provides real-time information on orca sightings to help boaters navigate safely. Apps like GT Orca and Orcinus can also be helpful tools to look out for orca attack.