Herbivore dinosaurs...

[Spalea]

" Properly termed hadrosaurs (or hadrosaurids), ‘duckbills’ – or ‘duckbilled dinosaurs’ – are a mostly Late Cretaceous group, mostly associated with eastern Asia and western North America (though with an actual range extending well beyond those regions). The exemplar for the group is the enormous Edmontosaurus, the several species of which have a tangled taxonomic history. At various times, the names Hadrosaurus, Diclonius, Claosaurus, Thespesius, Trachodon, Anatosaurus and Anatotitan have all been used for specimens now included in Edmontosaurus (Creisler 2007). Edmontosaurus reached 9 metres, weighed around 3 tons, and occurred from Colorado, USA, in the south to Alaska in the far north. Thanks to excellent, articulated skeletons and even mummified specimens that preserve large patches of skin, we know quite a lot about its life appearance. Despite long being regarded as a flat-headed, ‘plain’ hadrosaur, one specimen appears to demonstrate the presence of a soft, mound-shaped head crest (Bell et al. 2013), and others preserve substantial sections of the dorsal crest and scalation pattern (Osborn 1912, Horner 1984, Bell 2014). "

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