Head size and shape in relation to grass feeding in Acridoidea (Orthoptera)

Among grasshoppers, grass-feeding species had relatively very large heads and species feeding on other herbaceous plants had small ones. Those feeding on both food types were intermediate in size. These results are consistent with the hypothesis that head size is determined by the need for large mandibles and large mandibular adductor muscles, which are in turn associated with hard or tough diets.