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All answers having "Dodo" as clue:

3 Character Answers:

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ASS

IMA



4 Character Answers:

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BIRD



5 Character Answers:

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IDIOT

MORON

SCHMO



6 Character Answers:

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NIMROD



7 Character Answers:

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HALFWIT



9 Character Answers:

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BIRDBRAIN

IGNORAMUS



11 Character Answers:

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EXTINCTBIRD