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Re: Were dinosaur ecosystems continent-sized? (resend)

All the late Maastrichtian edmontosaurs are growth stages of E. annectens, 
with copei being the mature stage with long shovel grazing beaks that do not 
exist in specimens of 2 tonnes or less. Earlier E. regalis grew to the same 
final size of 3 tonnes, but the beak never elongates or squares off. The 
only major difference in the two taxa is the beak so Anatosaurus is a doubtful 

It is interesting that a hardosaur clade was getting big into grazing when 
that dang asteroid simply ruined things.