What kind of researchers work to record languages that are disappearing by finding the last speakers and making recordings and dictionaries to preserve them for the future?

Question

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Descriptive linguists are experts in studying and documenting languages, including producing dictionaries and grammars. This includes the documentation of endangered and extinct languages. They often work with speakers of these endangered languages to record their words and phrases for preservation. The other choices (historic linguists, cultural anthropologists, and sociolinguists) have different areas of focus and do not typically specialize in documenting endangered languages.

What Kind of Researchers Work to Record Languages That Are