 Many features of the hindlimb, including the long tibia and foot, as well as the fusion of the tibiofibiotarsus and tarsometatarsus, indicate that heterodontosaurids were adapted to run quickly on the hindlegs, so it is unlikely that "Heterodontosaurus" moved on all four limbs except perhaps when feeding.The short tusks found in all known heterodontosaurids strongly resemble tusks found in modern musk deer, peccaries and pigs.In many of these animals (as well as the longer-tusked walrus and Asian elephants), this is a sexually dimorphic trait, with tusks only found in males.