 ተመራማሪዎቹ አንዳንድ ሳይንቲስቶች እንደሚጠቁሙት ጎሳዎቹ በሚጠቀሙባቸው ቴክኒኮች እነዚህ ባህሪዎች ሊሳኩ እንደማይችሉ አጥብቀው ያምናሉ።
The researchers strongly believe that these characteristics could not have been achieved with the techniques used by the tribes as some scientists suggest.