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因为喉咙结构有别正常人，因此一辈子不能发声，克曼加人为世界上唯一不会说话的民族！

从长相来看，克曼加人与其他南美洲印第安人没有任何区别，印第安人有数百个分支，他们属其中一个。

不会说话原因，科学家估计跟遗传基因有关。克曼加人用眼神手势交流，极少有人懂他们的沟通方式。

同时，科学家对克曼加人的舌头和口腔研究后发现，该族人的喉咙长得和常人不一样，声带的自然压缩部分不能发声讲话，致使他们只能用手势沟通。

全世界现在有约4万克曼加人，在18世纪时，他们的总数一度超过10万，目前是世界濒危的民族之一。