Orcas Filmed Ramming Sunfish Until They Explode

Orcas in the Gulf of California have been filmed engaging in a novel hunting behavior, cooperating to ram sunfish with such force that the fish's carcasses explode into fragments. This behavior was documented in a new paper published in the journal Frontiers in Ethology. While orcas are known to use force to dismember prey, this specific method of causing a sunfish to explode is a new observation.

Co-author Kathryn Ayres of Beneath The Waves, a nonprofit organization focused on ocean health, suggested that this behavior might assist younger orcas in feeding or could be a form of play. Orcas are recognized for their playful interactions with their food. The observed action aligns with known cooperative hunting strategies employed by orcas, which can involve striking or killing animals, sometimes for consumption and sometimes not. This could be interpreted as a social interaction, play, or a method of social learning and practice.

Previous documented cooperative hunting strategies by orcas include ramming whale sharks while another orca stabilizes the prey. Other observed tactics involve herding mobile rays, strategically blocking escape routes for white sharks, and intentionally creating waves to dislodge penguins from ice floes. These complex behaviors highlight the sophisticated social structures and learned behaviors within orca populations.