Free images results:
 

Ant pictures, stock photos and images

 
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Flying ant Royalty Free Stock Photography
Author: Bogar
Ant Workers Stock Images
Author: Lycan
Tree Royalty Free Stock Photos
Author: Red2000
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Army ant Royalty Free Stock Photo
Author: Palych
Ant Stock Images
Ant
Author: Oriontrail