Marie Wilcox is a member of the Wukchumni tribe, and she is the last fluent speaker of her tribe's language. She spent seven years creating a Wukchumni dictionary, in an attempt to preserve the language for future speakers and future study. Today, around 200 Wukchumni remain, and the language is considered "critically endangered" by UNESCO, meaning it is likely to die out. Here is the story of one woman working to preserve the linguistic legacy of her people.
You can read more from the New York Times (warning: video auto-plays).>