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All answers having "Songbirds" as clue:

5 Character Answers:

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CHATS

LARKS

WRENS



6 Character Answers:

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SERINS

VIREOS



7 Character Answers:

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ORIOLES



8 Character Answers:

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SPARROWS



9 Character Answers:

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BOBOLINKS



11 Character Answers:

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MEADOWLARKS