One of Hawaii's gobies, barely half as long as a thumb, slowly creeps up a clear plate in the lab. Despite such slow progress, the species climbs waterfalls several hundred feet high in the wild by gripping rocks with its mouth and a tiny sucker.

Found in 'Rock-climbing fish caught in evolution tug-of-war' at sciencenews.org/view/generic/id/39710/title/Rock-climbing_fish_caught_in_evolution_tug-of-war

Credit: R. Blob and H. Schoenfuss