sentences:  In primates, positive allometry exists between the size of post canine teeth in primates and cranial length.This relationship has also been suggested in other groups of mammals, but the differences in postcanine size in primates are less variant compared to other mammals.Other species with herbivorous diets have adaptations in their post canines in order to eat plant material, but the term postcanine megadontia typically refers to the dental adaptation in the hominid group.