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