▁developing ▁to ▁replace ▁the ▁next ▁one . ▁Studies ▁of ▁the ▁teeth ▁also ▁reve al ▁that ▁it ▁preferred ▁different ▁veget ation ▁from ▁the ▁other ▁sau rop ods ▁of ▁the ▁Mor r ison , ▁such ▁as ▁Cam ar as aur us . ▁This ▁may ▁have ▁better ▁allowed ▁the ▁various ▁species ▁of ▁sau rop ods ▁to ▁exist ▁without ▁competition . ▁ ▁Sk in ▁ ▁F ew ▁skin ▁impress ions ▁of ▁di pl od oc ids ▁have ▁been ▁found . ▁However , ▁at ▁least ▁one ▁significant ▁find ▁was ▁reported ▁by ▁Stephen ▁C zer k as ▁in ▁ 1 9 9 2 . ▁F oss ils ▁from ▁the ▁How e ▁Qu ar ry ▁in ▁Sh ell , ▁Wy oming ▁preserved ▁port ions ▁of ▁the ▁skin ▁from ▁around ▁the ▁tip ▁of ▁the ▁tail , ▁or ▁" wh i pl ash ". ▁C zer k as ▁noted ▁that ▁the ▁skin ▁preserved ▁a ▁sequence ▁of ▁con ical ▁sp ines , ▁and ▁that ▁other , ▁larger ▁sp ines ▁were ▁found ▁scattered ▁around ▁larger ▁tail ▁verte bra e . ▁The ▁sp ines ▁appeared ▁to ▁be ▁orient ed ▁in ▁a ▁single ▁row ▁along ▁the ▁mid - line ▁of ▁the ▁tail , ▁and ▁C zer k as ▁spec ulated ▁that ▁this ▁mid line ▁row ▁may ▁have ▁continued ▁over ▁the ▁animal ' s ▁entire ▁back ▁and ▁neck . ▁ ▁G row th ▁Long - bone ▁hist ology ▁enables ▁research ers ▁to ▁estimate ▁the ▁age ▁that ▁a ▁specific ▁individual ▁reached . ▁A ▁study ▁by ▁Gr ie bel er ▁et ▁al . ▁( 2 0 1 3 )