feeding on seeds
• (a.) Eating grain; feeding or subsisting on seeds; as, granivorous birds.
Grain-eating.
Gra·niv'o·rous adjective [ Latin granum grain + vorare to devour: confer French granivore .] Eating grain; feeding or subsisting on seeds; as, granivorous birds. Gay. 
feeding on seeds or grain. E.g., House Sparrows are primarily granivorous. Also graminivorous?
granivorous, granivore, granivory Eating and subsisting on seeds.
Grain-eating
Feeding on seeds or grain.
Eating grain or seeds.
feeding on grain and seeds