The part of alimentary system of a bird where food is ground into small particles is the

The part of the alimentary system of a bird where food is ground into small particles is the gizzard. The gizzard is a muscular, thick-walled part of the bird's stomach that grinds food with the help of small stones and grit that the bird has swallowed. The muscles of the gizzard contract and relax rhythmically to mix and grind the food, breaking it down into small particles that can be further digested and absorbed. The gizzard is an important adaptation for birds that consume hard-shelled seeds or insects with tough exoskeletons.