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All answers having "Long-legged bird" as clue:

3 Character Answers:

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EMU



4 Character Answers:

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IBIS



5 Character Answers:

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CRAKE

CRANE

EGRET

HERON

STILT

STORK

WADER



6 Character Answers:

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AVOCET

CURLEW



8 Character Answers:

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FLAMINGO