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Ankylosaurs & Nodosaurs

A thought struck me the other day; most nodosaurs dies out in the early
Cretaceous, right? It seems that ankylosaurs were advanced relatives, if not
off-set descendants of the nodosaurs. Why then, were there nodosaurs, and big
ones, like Edmontonia, still around at the end of the dinosaur reign with the
likes of Euplocephalus and Ankylosaurus? What advantage did nodosaurs have over

 Just wondering...

                                        Aaron Gwin