Free images results:

Horns pictures, stock photos and images

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Cow Stock Image
Author: Andresr
Rhino Royalty Free Stock Photos
Author: Barsik
Cow Stock Photo
Author: Pryzmat
Fawn Royalty Free Stock Photos
Author: Jamiewilson
Billy Royalty Free Stock Images
Author: Tiger9911
Stag Royalty Free Stock Image
Author: Kevd
Old Goat Stock Photo
Author: Wishfoal
Giraffe Royalty Free Stock Photo
Author: Cjwright
Rhino Stock Images
Author: Gertfrik
Black buck Stock Images
Author: Plsa
Ibex Stock Image
Author: Michaf
Stag-head Stock Images
Author: Michaf
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Also, here are some commercial RF-licensed images that match your search criteria:  
Horns Stock Image
Author: Dimitrii
Horns Stock Photo
Author: Tribalium