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All answers having "Songbird" as clue:

3 Character Answers:

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JAY

TIT

TOO



4 Character Answers:

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CHAT

FEUD

LARK

WEAR

WREN



5 Character Answers:

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ERUPT

FINCH

PIPIT

ROBIN

SERIN

SPROW

VIREO

WREAK



6 Character Answers:

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CANARY

LINNET

ORIOLE

OSCINE

RAPIDS

SHRIKE

SMOOTH

THRUSH



7 Character Answers:

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REDWING

SKYLARK

SPARROW

SWALLOW

TANAGER

WAGTAIL

WARBLER



8 Character Answers:

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BOBOLINK

MIGRAINE

NUTHATCH

REDSTART

WHEATEAR



9 Character Answers:

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HOIPOLLOI



10 Character Answers:

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BLUETHROAT

MEADOWLARK



11 Character Answers:

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NIGHTINGALE



15 Character Answers:

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BALTIMOREORIOLE