Free images results:

Grassland pictures, stock photos and images


Cow Royalty Free Stock Image
Author: Darklord_71
White Bird Royalty Free Stock Photo
Author: Joseph
White Bird Stock Images
Author: Joseph
Vanessa jo Royalty Free Stock Photography
Author: Kgena

Also, here are some commercial RF-licensed images that match your search criteria:  
Grassland Royalty Free Stock Photos
Author: Boluo
Grassland Stock Images
Author: Fmarka
Grassland Stock Image
Author: Nohead