If it will fit into their face, birds will eat it.
If it will not fit into their face, birds will attempt to eat it anyway, and will likely succeed out of sheer spite and hubris.
People are worried about snakes sizing them up to eat (which they don’t even do, by the way), but snakes are just a spine with a face. Ratites like the cassowary here are basically velociraptors that did not Survive The Apocalypse just to put up with human nonsense about who can eat an apple faster. They can. And you’re next.
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