Free images results:

Mallard pictures, stock photos and images


Mallard Royalty Free Stock Photo
Author: Caramaria
Mallard Duck Stock Image
Author: Dax
Duck! Royalty Free Stock Image
Author: Ikegami
Wild duck Royalty Free Stock Photo
Author: Jirsa
Bath time Stock Photo
Author: Cinc212
Duck Royalty Free Stock Photography
Author: Joseph
Wet duck Stock Image
Author: Thorr
Duck Royalty Free Stock Images
Author: Chuew
Dusk duck Royalty Free Stock Photos
Author: Frosty
Zig-zag Stock Image
Author: Cinc212

Also, here are some commercial RF-licensed images that match your search criteria:  
Mallard Stock Photography
Author: Bkushner

Explore more commercial options: More Mallard Stock Illustrations & Vectors | More Mallard Stock Video Footage