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All answers having "Bird sound" as clue:

3 Character Answers:

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CAW

COO



4 Character Answers:

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CROW

HONK

HOOT

NOTE

PEEP

TWEE



5 Character Answers:

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CHEEP

CHIRP

QUACK

TRILL

TWEET



6 Character Answers:

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SQUAWK



7 Character Answers:

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COCKCRY

TIRALEE

TWITTER