Dinosaurs were a vertebrate animal that dominated Earth for over 160 million years, first appearing approximately 230 million years ago. At the same time the term dinosaur is many times used generically to describe other prehistoric reptiles, such as the pelycosaur Dimetrodon, the winged pterosaurs, and the aquatic ichthyosaurs, plesiosaurs and mosasaurs, although technically none of these were dinosaurs. In this post that might happen, so for the technical reader, I apoligize in advance.
Baryonyx
Baryonyx was a dromaeosaurid that lived during the Cretaceous period. Baryonyx means "heavy claw" from the Greek word "barus" meaning heavy and onyx, meaning "claw" or "nail". Due to the elongated jaw and curved, "heavy" claws on Baryonyx, it mostly likely consumed fish as it primary food source. The jaw, mouth, could be plunged into the water a lot further, so as to snap up fish, without dunking its entire head in the water. It large, curved claws on it hands were ideal for grasping fish and keeping them from flopping out of its hands before being eaten.
Baryonyx was about 40 ft, and around 16 ft. tall. It probably weighed in the region of 3,600 kg. The curved neck of Baryonyx was ideal for fishing, as it was at an acute angle, instead of a 90 degree angle, like most dinosaurs. This way it could rest on it's powerful front arms and comb the river for fish. The "S" curve of its neck supports this theory. Baryonyx was a piscivorous (fish-eating) dinosaur. Among others is the Eqyptian piscivorous, Suchomimus.
Huayangosaurus
Huayangosaurus was a stegosaurian from Mid-Jurassic period that lived in what is now China. It derives its name from "Huayang" an alternate name for Sichuan, the province where it was discovered. It's more famous American relative was Stegosaurus. At only 4.5 metres long, it was also much smaller than its famous cousin.
Like many other stegosaurians it had plates all down its back, and spikes on its tail. The two large spikes were above its hips, help protect it and deter attacks from carnivores. Like the spikes on its tail, although these could be swung at predators. Its plates were smaller than those of Stegosaurus, with much less surface area. Thus they would have been much less effective heat regulators, one of the postulated functions of plates.
Oviraptor
Oviraptor, Latin for "egg thief", due to the fact that the first fossil found of this theropod were found with egg remains in the stomach. Oviraptor, as pictured above, also hunted on small mammals, lizards, and dinosaurs. Many different postulations have been made as to the diet and actions of Oviraptor. For a complete read on Oviraptor vist wikipedia.org
Parasaurolophus
Parasaurolophus was a hadrosaurid (duck-billed dinosaur) from the Cretaceous period. It's name means "near crested lizard" referring the the crest protruding from the back of its skull.
Parasaurolophus were about 33 ft long, 16 ft high and weighed around 7,700 lbs. Like other hadrosaurs, they were facultatively bipedal, i.e. they could alternate between two legs and four, probably preferring a quadrupedal gait while they foraged for food and assuming a bipedal mode for faster running.
Notable is the crest on it's head. It has been speculated, that because it was hollow, it allowed the Parasaurolophus and other hadrosaurids with crests, to communicate within their species. Either using them as communication within herds, or as "chit chat" between males and females when mating. Some even say that this crest gave Parasaurolophus a excellent sense of smell, as well.
Spinosaurus
Many people know the Spinosaurus due to it's exposure as the main antagonist of Jurassic Park III. Although he was the largest predator at the time in the Cretaceous period, he was not as large as depicted in the movie, and not as bloodthirsty. Although there are many disputes about the size, weight, and temperament of Spinosaurus, he was a carnivore that feed on other dinosaurs. Different sources have given this dinosaur a size of anywhere from 50-10 ft long, and anywhere from 6 to 19 tons. As the picture above shows, experts can't even agree on whether the sail on Spinosaurus' back was bone with skin between the bone, much like Dimetrodon or solid, like the above picture, which would have added to the dinosaur's mass. The many issues regarding Spinosaurus are due to a lack of key skeletal findings or fossils to support these speculations.
So, if you are still with me, and have actually read all this, or if you have just looked at the purdy 8-) pictures and scanned down to here . . .
What dinosaur would you want to be? And why? What are your reasons for picking the dinosaur that you do? If none of these interest you check the list of dinosaurs at wikipedia for a more extensive look.
Me? Well first off, Baryonyx has always interested me. If it were to be a anything else, it would be Pachycephalosaurus because I have been told that I am hard-headed. 8-)