sentences: a dolphin can balance a ball on its nose
docs: oceanic_dolphin is mammal. atlantic_white_sided_dolphin is mammal. spinner_dolphin is mammal. dolphin is toothed_whale. commerson's_dolphin is mammal. australian_snubfin_dolphin is mammal. dolphin is animal. pacific_white_sided_dolphin is mammal. white_beaked_dolphin is mammal.