Two Parasaurolophus dinosaurs bellow at each other.

2 ANIMALS • ANIMAL THEMES • ANIMAL • ANIMALS IN THE WILD • AQUATIC • ARTWORK • BEACH • BIPED • BODY OF WATER • COLOR IMAGE • COLOUR IMAGE • CONCEPT • CREATION • CREATURE • CRETACEOUS • DAY • DIGITALLY GENERATED IMAGE • DINOSAUR • DINOSAURS • DUCKBILL DINOSAURS • ENVIRONMENT • EVOLUTION • EXISTENCE • EXTINCT • FLEET • FULL LENGTH • FULL-LENGTH • GRAZING • GROWL • HABITAT • HADROSAURID • HERBIVORE • HORIZONTAL • HORNED • ILLUSTRATION • ILLUSTRATIONS • ILUSTRATION • IMAGINATION • JURASSIC • LARGE • LOOKING UP • MAMMAL • MARINE • MESOZOIC ERA • NATURE • NAVY • NO PEOPLE • OASIS • OCEAN • OCEANS • ORIGIN • ORNITHOPOD • OUTDOOR • OUTDOORS • OUTSIDE • PALAEONTOLOGY • PALAEOZOOLOGY • PALEONTOLOGY • PALEOZOOLOGY • PARASAUROLOPHUS • PAST • POWERFUL • PREHISTORIC ERA • PRIMEVAL • PRIMITIVE • REPTIL • REPTILE • REPTILES • ROAMING • ROARING • SCIENCE: EVOLUTION • SEA • SEA. • SEAS • SHORE • SPECIES • TOGETHERNESS • TWO ANIMALS • VERTEBRATE • WATER'S EDGE • WATER • WAVE • WILDERNESS • WILDLIFE • WITHOUT PEOPLE • ZOOLOGY