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poor Einiosaurus

Dixon (2006) lists this Centrosaurine as living during the Campanian stage of 
the late Cretaceous, contemporary with Gorgosaurus and Daspletosaurus.  With a 
nose horn that pointed down, when one of these large tyrannosaurids was closing 
in I can't see Einio doing much outside of tapping "S.O.S." on the ground with 
it.  Could it "ram" the legs of these hungry predators, toppling them or 
breaking leg bones with this horn?  It just doesn't seem to be of much obvious 
use against an adult - especially Daspletosaurus.  I don't know what the 
current view is of how fast Einio could run away, or if there was some sort of 
inter-species herding with better equipped-for-defense herbivores.  Seems to be 
an easy lunch?