Board Thread:General Discussion/@comment-26955524-20161126192429/@comment-27265101-20170226214114

No, he created fire to destroy plants, famine to kill animals and drought to get rid of water. The Grimm were directly said to be created as a mockery of something and I believe that something was what the Faunus used to be.

Besides Grimm have never focused on an animal in the show also if they were meant to destroy plants any location they took over would become a barren lifeless wasteland.