A herd of Parasaurolophus dinosaurs during Earth's Cretaceous period.

ANIMAL FAMILY • ANIMAL THEMES • ANIMAL • ANIMALS IN THE WILD • AQUATIC • ARTWORK • COLOR IMAGE • COLOUR IMAGE • CREATION • CREATURE • CRETACEOUS • DAY • DIGITALLY GENERATED IMAGE • DINOSAUR • DINOSAURS • DRINKING • DUCKBILL DINOSAURS • ENVIRONMENT • EVOLUTION • EXISTENCE • EXTINCT • FRESH WATER • FRESHWATER • GEOLOGIA • GEOLOGY • GRAZING • HABITAT • HADROSAURID • HERBIVORE • HERD • HORIZONTAL • ILLUSTRATION • ILLUSTRATIONS • JURASSIC • LANDSCAPE • LANDSCAPES • LATERAL VIEW • MARSH • MEDIUM GROUP OF ANIMALS • MESOZOIC ERA • MOUNTAIN • NATURAL HISTORY • NATURAL SCIENCES • NATURE STUDY • NATURE • NO PEOPLE • OASIS • ORIGIN • ORNITHISCHIA • ORNITHOPOD • OUTDOOR • OUTDOORS • OUTSIDE • PALAEONTOLOGY • PALAEOZOOLOGY • PALEONTOLOGY • PALEOZOOLOGY • PARASAUROLOPHUS • PAST • PREHISTORIC ERA • PRIMEVAL • PRIMITIVE • REPTIL • REPTILE • REPTILES • ROAMING • SALTMARSH • SCIENCE • SCIENCE: EVOLUTION • SHALLOW • SIDE VIEW • SPECIES • STREAM • SWAMP • TOGETHERNESS • TRANQUILITY • VERTEBRATE • WATER • WETLANDS • WILDERNESS • WILDLIFE • WITHOUT PEOPLE • ZOOLOGY