, ▁and ▁alg ae . ▁Stevens ▁and ▁Par ish ▁( 2 0 0 5 ) ▁spec ulate ▁that ▁these ▁sau rop ods ▁fed ▁from ▁river b anks ▁on ▁sub mer ged ▁water ▁plants . ▁ ▁A ▁ 2 0 1 5 ▁study ▁of ▁the ▁ne cks ▁of ▁A pat osa urus ▁and ▁Br ont osa urus ▁found ▁many ▁differences ▁between ▁them ▁and ▁other ▁di pl od oc ids , ▁and ▁that ▁these ▁variations ▁may ▁have ▁shown ▁that ▁the ▁ne cks ▁of ▁A pat osa urus ▁and ▁Br ont osa urus ▁were ▁used ▁for ▁in tras pec ific ▁combat . ▁Vari ous ▁uses ▁for ▁the ▁single ▁cla w ▁on ▁the ▁for el imb ▁of ▁sau rop ods ▁have ▁been ▁proposed . ▁One ▁suggestion ▁is ▁that ▁they ▁were ▁used ▁for ▁defense , ▁but ▁their ▁shape ▁and ▁size ▁make ▁this ▁unlikely . ▁It ▁was ▁also ▁possible ▁they ▁were ▁for ▁feed ing , ▁but ▁the ▁most ▁probable ▁use ▁for ▁the ▁cla w ▁was ▁grasp ing ▁objects ▁such ▁as ▁tree ▁tr unks ▁when ▁re aring . ▁ ▁Track ways ▁of ▁sau rop ods ▁like ▁A pat osa urus ▁show ▁that ▁they ▁may ▁have ▁had ▁a ▁range ▁of ▁around ▁ ▁per ▁day , ▁and ▁that ▁they ▁could ▁potentially ▁have ▁reached ▁a ▁top ▁speed ▁of ▁ ▁per ▁hour . ▁The ▁slow ▁lo com otion ▁of ▁sau rop ods ▁may ▁be ▁due ▁to ▁their ▁minimal ▁mus cling , ▁or ▁to ▁re co il ▁after ▁str ides . ▁A ▁track way ▁of ▁a ▁ju ven ile ▁has ▁led ▁some ▁to ▁believe ▁that