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Su idioma es el kawésqar, nombre con el que ellos se autodenominan. En su idioma, esta palabra significa "persona" o "ser humano". El nombre alacalufe originalmente puede haber tenido una intención despectiva y ellos no lo usan.
Se alimentaban de nutrias, huemules, mariscos, peces, aves, plantas, semillas, y focas; animales de los que también aprovechaban sus pieles para vestirse y, sus huesos para fabricar diversas herramientas, como arpones y cuchillos.

More On... His language is the kawésqar, name with which they autoname. In his language, this word "person" means or " to be a human being ". The name alacalufe originally can have had a contemptuous intention and they do not use it. There were fed on otters, huemules, seafood, fish, birds, plants, seeds, and seals; animals of those who also were taking advantage of his skins to dress and, his bones to make diverse tools, as harpoons and knives.