plesiosaurus silhouette - elasmosaurus

animal aquatic beast big carnivorous cartoon chordata colossal danger dinosaur diving elasmosauridae elasmosaurus elusive extinct fast fauna freshwater graphic history hunter icon illustration jurrasic lake large loch long marine monster mysterious ness nimble ocean paleontology plesiosauria plesiosaurus predator prehistoric saltwater sauropsida sauropterygia sea silhouette survivors swim underwater vertebrata water wild