Free images results:
 

Quack pictures, stock photos and images

 
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Bath time Stock Photo
Author: Cinc212
Duck! Royalty Free Stock Image
Author: Ikegami
Zig-zag Stock Image
Author: Cinc212
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Quack Stock Image
Author: Zsolti72
Quack Stock Photo
Author: Hardhhhat
Duck Royalty Free Stock Photo
Author: Ealvik
Shyness Royalty Free Stock Photos
Author: Baz777
Euro Royalty Free Stock Photos
Author: Baz777
Bird flu Royalty Free Stock Photo
Author: Baz777