Scientists have recorded the first-ever evidence of killer whales and Pacific white-sided dolphins hunting together. The rare footage was captured off the coast of British Columbia, Canada. Researchers used drones and camera tags to study the feeding behavior of killer whales. "Not only were the killer whales orienting [themselves] towards the dolphins at the surface, but when the dolphins started to dive, our tagged killer whales would start to dive," said lead researcher Dr Sarah Fortune from Dalhousie University. The findings were published in the journal Nature Scientific Reports, confirming for the first time that these two species work cooperatively during hunts.