Free images results:
 

Flies pictures, stock photos and images

 
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Sleeping Lion Stock Image
Author: Mhd
The Fly Royalty Free Stock Photography
Author: Marilyna
Thistle Stock Photo
Author: Mkartal
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Flies Royalty Free Stock Images
Author: Qqzoe
Flies Royalty Free Stock Photos
Author: 100miles
Dead flies Royalty Free Stock Photography
Author: Plmrue
Flies Stock Photos
Author: Mudong