Free images results:
 

Ostriches pictures, stock photos and images

 
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Ostrich Stock Image
Author: Kiankhoon
Ostrich Royalty Free Stock Photos
Author: Hljdesign
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Ostriches Stock Photos
Author: Smellme
Ostriches Stock Image
Author: Sepavo