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All answers having "Young bird" as clue:

5 Character Answers:

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CHICK

OWLET



6 Character Answers:

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CYGNET

EAGLET

PEEPER



7 Character Answers:

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GOSLING

NESTLER



8 Character Answers:

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NESTLING



9 Character Answers:

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FLEDGLING



13 Character Answers:

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SPRINGCHICKEN