▁vo iced ▁by ▁Rob ▁Paul sen ▁( II - V , ▁VII - X IV ) ▁and ▁Jeff ▁Ben nett ▁( VI ), ▁is ▁a ▁male ▁green ▁Ste g osa urus , ▁or ▁" Sp ik et ail ". ▁Despite ▁being ▁the ▁largest , ▁he ▁is ▁actually ▁the ▁young est ▁of ▁the ▁original ▁main ▁characters ; ▁his ▁h atch ing ▁being ▁witness ed ▁by ▁D ucky ▁whose ▁parents ▁later ▁adopted ▁him . ▁He ▁is ▁character ized ▁as ▁gl utton ous , ▁laid - back ▁and ▁rarely ▁speak s , ▁communic ating ▁mostly ▁in ▁gr un ts ▁or ▁sc at ▁singing . ▁During ▁the ▁fourth ▁film , ▁J our ney ▁Through ▁the ▁M ists , ▁he ▁speak s ▁for ▁the ▁first ▁time , ▁calling ▁D ucky ' s ▁name , ▁and ▁again ▁in ▁the ▁e ighth ▁film ▁The ▁Big ▁Free ze , ▁where ▁he ▁calls ▁out ▁to ▁his ▁mother . ▁In ▁the ▁same ▁movie , ▁it ▁is ▁mentioned ▁that ▁his ▁birth ▁parents ▁were ▁probably ▁lost ▁in ▁the ▁earth qu ake ▁of ▁the ▁first ▁film , ▁and ▁becomes ▁close ▁friends ▁with ▁another ▁Ste g osa urus ▁named ▁T ipp y . ▁The ▁TV ▁series ▁episode ▁" T hr ough ▁the ▁E yes ▁of ▁a ▁Sp ik et ail ", ▁is ▁told ▁largely ▁from ▁S pi ke ' s ▁point ▁of ▁view , ▁where ▁he ▁speak s , ▁internally , ▁with ▁a ▁low ▁voice , ▁and ▁can ▁" he ar " ▁the ▁song ▁of ▁plants ▁that ▁guide ▁him ▁to ▁them . ▁ ▁S pi ke '