関連ワード:
do primates have opposable thumbs does primates have opposable thumbs do chimps have opposable thumbs do monkeys have opposable thumbs on their feet do monkeys have opposable thumbs like humans do chimps have opposable thumbs on their feet do apes have opposable thumbs on their feet do monkeys have opposable thumbs on feet do chimpanzees have opposable thumbs on their feet did primates have opposable thumbs
