Free images results:
 

Horn pictures, stock photos and images

 
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Rhino Stock Image
Author: Twistntail
Rhino 3 Royalty Free Stock Photo
Author: Faidoi
Dragon 3 Royalty Free Stock Photos
Author: Caraman
Black buck Stock Images
Author: Plsa
Black buck Stock Images
Author: Plsa
Ibex Stock Image
Author: Michaf
Lamb Muflon Stock Images
Author: Odm
Stag-head Stock Images
Author: Michaf
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Horn Stock Photography
Author: Pferd
Horn Stock Images
Author: Guava
Big horn Stock Image
Author: Pferd
Horn Stock Photos
Author: Kaarsten