Researchers from the University of Hawaii have released 'groundbreaking' footage of humpback whales feeding in waters off southeast Alaska.
The images, captured both from an aerial drone and the whale's point-of-view, show how some whales use bubbles to optimise their consumption of prey by creating bubble nets.
As the name suggests, the whales blow bubbles beneath a school of fish, creating a 'net' in the process, and allowing the whales to consume many hundreds of fish at once.
Lars Bejder, Director of the University of Hawaii Manoa Marine Mammal Research Program, said: "The footage is rather groundbreaking.
"We're observing how these animals are manipulating their prey and preparing the prey for capture. So it is allowing us to gain new insights that we really haven't been able to do before."
The researchers used suction-cup tags fitted with cameras to capture footage from the whale's perspective.