▁Dr ▁Good all ▁dev otes ▁virt ually ▁all ▁of ▁her ▁time ▁to ▁advoc ating ▁on ▁beh alf ▁of ▁ch imp anze es ▁and ▁the ▁environment , ▁travel ing ▁nearly ▁ 3 0 0 ▁days ▁a ▁year . ▁ ▁Good all ▁was ▁instrument al ▁in ▁the ▁study ▁of ▁social ▁learning , ▁prim ate ▁cogn ition , ▁thinking ▁and ▁culture ▁in ▁wild ▁ch imp anze es , ▁their ▁different iation ▁from ▁the ▁bon ob o , ▁and ▁the ▁inclusion ▁of ▁both ▁species ▁along ▁with ▁the ▁g or illa ▁as ▁H omin ids . ▁ ▁One ▁of ▁Good all ' s ▁major ▁contributions ▁to ▁the ▁field ▁of ▁prim at ology ▁was ▁the ▁discovery ▁of ▁tool ▁making ▁in ▁ch imp anze es . ▁She ▁discovered ▁that ▁some ▁ch imp anze es ▁alter ▁pieces ▁of ▁grass ▁or ▁tw igs ▁and ▁then ▁po ke ▁them ▁into ▁term ite ▁m ounds . ▁The ▁term ites ▁would ▁grab ▁onto ▁the ▁bla de ▁of ▁grass ▁or ▁tw ig ▁with ▁their ▁mand ibles ▁and ▁the ▁ch imp anze es ▁would ▁then ▁just ▁pull ▁the ▁grass ▁out ▁and ▁eat ▁the ▁term ites . ▁Though ▁many ▁animals ▁had ▁been ▁clearly ▁observed ▁using ▁" tools ", ▁previously , ▁only ▁humans ▁were ▁thought ▁to ▁make ▁tools , ▁and ▁tool - making ▁was ▁considered ▁the ▁defining ▁difference ▁between ▁humans ▁and ▁other ▁animals . ▁This ▁discovery ▁convinced ▁several ▁scient ists ▁to ▁re cons ider ▁their ▁definition ▁of ▁being ▁human . ▁Another ▁characteristic ▁of ▁the ▁ch imp anze e ▁that ▁Good all ▁discovered ▁was ▁their ▁co oper ative ▁hunting ▁of