For the first time, scientists have captured video evidence of orcas cooperatively hunting whale sharks, the largest species of fish on Earth. This graphic footage proves that whale sharks are a regular part of some orcas’ diets, and solves the mystery of how they are able to kill the massive fish.

The dinner menu for the world’s orca whales is pretty varied. Some, like the crafty transient killer whales in the Pacific northwest, use canyons to hunt other marine mammals, while others feast on salmon exclusively.

Off the coast of Mexico, scientists have observed a pod of killer whales adapting new skills to help them hunt these docile giants of the sea.