▁The ▁Jar aw as ▁have ▁been ▁around ▁for ▁a ▁long ▁time . ▁They ▁are ▁believed ▁to ▁be ▁descend ants ▁of ▁the ▁J ang il ▁tribe ▁and ▁it ▁is ▁estimated ▁that ▁they ▁have ▁been ▁in ▁the ▁And aman ▁Islands ▁for ▁over ▁two ▁mill enn ia . ▁The ▁Jar aw as ▁were ▁both ▁lingu ist ically ▁and ▁cult ur ally ▁distinguished ▁from ▁the ▁Gre ater ▁And aman ese , ▁who ▁did ▁not ▁surv ive ▁over ▁the ▁years . ▁The ▁early ▁colon is ations ▁by ▁the ▁Jar aw as ▁showed ▁evidence ▁that ▁there ▁was ▁an ▁early ▁movement ▁of ▁humans ▁through ▁southern ▁Asia ▁and ▁indicate ▁that ▁phen ot yp ic ▁similar ities ▁with ▁African ▁groups ▁are ▁conver gent . ▁There ▁are ▁also ▁believed ▁to ▁be ▁the ▁first ▁successful ▁tribe ▁to ▁move ▁out ▁of ▁Africa . ▁Any ▁form ▁of ▁evidence ▁on ▁the ▁Jar aw as — social , ▁cultural , ▁historical , ▁arch ae ological , ▁lingu istic , ▁phen ot yp ic , ▁and ▁gen etic — support ▁the ▁conclusion ▁that ▁the ▁And aman ▁Island ers ▁have ▁been ▁isolated ▁for ▁a ▁substantial ▁period ▁of ▁time , ▁which ▁suggests ▁why ▁they ▁have ▁been ▁able ▁to ▁surv ive ▁despite ▁modern ization . ▁ ▁The ▁Jar aw as ▁are ▁one ▁of ▁the ▁three ▁surv iving ▁tribes ▁in ▁the ▁area , ▁the ▁other ▁two ▁being ▁S entin el ese ▁and ▁On ge . ▁This ▁tri ad ▁is ▁connected ▁with ▁the ▁Gre ater ▁And aman ese ▁language ▁cla de ▁on ▁a ▁typ ological — r ather ▁than ▁a ▁cogn atic — bas