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There are many other hadrosaurs known, but the ones in this pack represent most of the major types. Many of the crestless hadrosaurines looked very similar to each other (for example, there is still debate over whether Anatosaurus, Anatotitan, Trachodon, and Edmontosaurus are different types at all - some may simply have been large individual specimens of Edmontosaurus), while the giant Asian Shantungosaurus was also very similar. Others are left out because they are only known from partial remains (for example, the Russian lambeosaurine Charonosaurus may have been very similar to the North american Parasaurolophus, but no skeletons with complete crests have been discovered to date. Earlier in 2008, a new lambeosaurine, Velafrons from Mexico was described - but I had to draw a limit somewhere!
Hadrosaurs (or 'Duckbilled Dinosaurs') were one of the last major dinosaur groups to appear. They apparently evolved from small iguanodonts in the first part of the Late Cretaceous Period, about 100 million years ago, but rose to prominence about 80 million years ago. Over time, they had lost their thumbs, and their plant-eating beaks became more pronounced. In the early days of paleontology, their deep narrow tails and apparently-webbed fingers made them seem like aquatic animals (in keeping with their ducklike beaks). Now, however, we know that the three middle fingers were actually enclosed in a hooflike mitten of flesh, and the hadrosaurs were found in a variety of environments.
There are two major groups of hadrosaurs - the first, known as Lambeosaurines, were identifiable by the large hollow crests of bone on their heads. The other group, the Hadrosaurines, either had smaller solid crests or no crests at all, and broader beaks.
The late Cretaceous is well represented by Poser/DS dinosaurs. Among the plant-eaters, in addition to the hadrosaurs, this was the period of the ceratopsians (hornheads such as Triceratops and its relatives), as well as the armoured tank-like ankylosaurs. Preying on all of these plant-eaters were the fearsome tyrannosaurs, as well as mid-sized (dromaeosaurine) 'raptors. Birds were common, and the last few giant pterosaurs also flew overhead - the last few Pteranodon might have been around at the beginning of the hadrosaurs' reign, and the even larger 'azhdarchids' (Quetzalcoatlus etc) were around until the very end of the Cretaceous. Many modern types of plants had appeared, although there was still no grass.
The oceans at the time were ruled by giant lizards called mosasaurs, as well as fish-eating plesiosaurs and giant turtles.