Humpback whales have — for the first time ever — been filmed rolling to and fro on sandy seabeds to scrub off dead skin and unwanted hitchhikers.
Footage captured by researchers in the Gold Coast Bay in southeast Queensland, Australia, shows the gigantic marine mammals performing full and side "sand rolls" up to 164 feet (50 meters) below the ocean's surface to shed parasites that live on their skin, known as ectoparasites, which can make the whales less hydrodynamic.
