Bipeds moving on land are of two sorts, viz., middling or intermediate, and those that are foremost. Of these, the middling or intermediate are considered as superior (to the foriner) for their observing the duties of caste.
पार्थिवानि द्वयान्याहुर्मध्यमान्यधमानि तु। मध्यमानि विशिष्टानि जातिधर्मोपधारणात्॥