Free images results:
 

Bull pictures, stock photos and images

 
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Bull Snake Royalty Free Stock Image
Author: Bigo
Cow Stock Image
Cow
Author: Andresr
Bulls Stock Photos
Author: Melster
Elephant Stock Photo
Author: Ice
Elephant Stock Photos
Author: Ice
Elephant Stock Image
Author: Ice
Frog Royalty Free Stock Images
Author: Chuew
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
No Bull Royalty Free Stock Photo
Author: Blakeley
Bull's Eye Royalty Free Stock Photos
Author: Blur