Free images results:
 

Zoo pictures, stock photos and images

 
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Rhino 3 Royalty Free Stock Photo
Author: Faidoi
Parrot Stock Photography
Author: Sharpliner
Lizard 2 Stock Image
Author: Tjbel05
ANIMALISSIMO Stock Photography
Author: Mkoh
Eagle Royalty Free Stock Images
Author: Tanyab
Billy Royalty Free Stock Images
Author: Tiger9911
Bird Royalty Free Stock Images
Author: Jameshearn
Lemur Stock Photos
Author: Freddygood
Camel Stock Images
Author: Freddygood
Dolphin Stock Images
Author: Pdiaz
Zebra b/w Royalty Free Stock Photos
Author: Ukapala
Meerkats Royalty Free Stock Photo
Author: Seamoon
Parrot Royalty Free Stock Image
Author: Tjbel05
Lizard Royalty Free Stock Photo
Author: Tjbel05
Young elk Stock Photos
Author: Kovalvs
Penguin Royalty Free Stock Photos
Author: Tjbel05
FLAMINGO Stock Images
Author: Mkoh
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
In zoo Stock Photos
Author: Josephina
Zoo Royalty Free Stock Photography
Zoo
Author: Alladinian