 On the other hand, the orbit in "O. leptodon" has an anterior edge that is only slightly concave, whereas it is deeply notched in "O. peruvianus" which suggests that "O. peruvianus" used binocular vision.Analyses of neck bones of both species suggest that "Odobenocetops" swam with its head bent ventrally, which would have brought the long right tusk in males in parallel to the body and allowed "O. leptodon" good use of its binocular vision.Perhaps the most striking discovery was that of a male "O. leptodon" skull with a tusk significantly longer than the other.