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All answers having "Aquatic bird" as clue:

3 Character Answers:

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AUK

ERN



4 Character Answers:

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COOT

DUCK

ERNE

GULL

LOON

SWAN

TERN



5 Character Answers:

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CRANE

EGRET

GREBE

LANCE



6 Character Answers:

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ANATID

COSSET



7 Character Answers:

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ECLIPSE

MOORHEN



8 Character Answers:

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FLAMINGO

SHELDUCK

VENERATE



9 Character Answers:

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CORMORANT

HELLDIVER

RASTAFARI