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> I think the best evidence for cassowaries being more aggressive than
> emus lies in those carving-knife shaped inner toe claws. You don't
> develop something that is so obviously a defensive weapon without the
> need to use it. What is it about theropods and inner toe claw weapons
> anyway? :)

Harpyias (*Harpia harpyja* -- I hate such names) have very similar claws on
their 2nd toes for obvious reasons (makes speculations that they evolved as
a climbing aid in more basal theropods unnecessary).