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All answers having "Amphibians" as clue:

4 Character Answers:

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EFTS



5 Character Answers:

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FROGS

HOPES

NEWTS

TOADS



7 Character Answers:

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AMTRACS



9 Character Answers:

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SEAPLANES

TREETOADS



11 Character Answers:

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SALAMANDERS



13 Character Answers:

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SITTINGPRETTY