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  1. What other ways are there to equivalently express this sentence?

I don't know if equivalently, but you could also say it like this:

Ĉu anaso estas tro granda por esti manĝita de X?
  1. What makes my initial guesses incorrect?

Check this page in PMEG about tro. The answers to this post are in the section Tro + klariga esprimo.