“An endangered language, or moribund language, is a language that is at risk of falling out of use as its speakers die out or shift to speaking another language. Language loss occurs when the language has no more native speakers and becomes a ‘dead language'” (Wikipedia).

Please see below for links to articles about endangered languages. For a more academic source than Wikipedia, Ethnologue is a great place to start (e.g. see chart for numbers of living languages, by continent).
Endangered & Indigenous Languages
- Aymara: Past/Future (Bolivia, Peru, Chile)
- Sea Gypsies See Signs in the Waves (Moken Language)
- Protection for Turkey’s ‘Bird Language’
- Greece’s Disappearing Whistled Language
- Meet the Huli Wigmen of Tari Highlands, Papua New Guinea
- 7 Languages on the Verge of Extinction
- The People Saving ‘Lost’ Words
- Endangered Languages (Interactive Map)
- Why We Must Save Dying Tongues
- The Achuar: Ancient People of Ecuador
- Plant Spirit Shamanism: Hearing the Call of the Plants
- People and Trees: Intimately Connected Through the Ages
- They Hunt. They Gather. They’re Very Good at Talking About Smells.
- From Amazon to Garden State (Yanomami Territory, Venezuela)
- Arunachal Pradesh, India, Hidden Koro Language (Enduring Voices)
- Ethnologue: Languages of the World (Endangered Languages)
- The quest to save a dying Spanish dialect in Colorado’s San Luis Valley: “A treasure that exists nowhere else in the world”
- Why Last Two Speakers Of Ayapaneco Don’t Talk To Each Other (Mexico)
- Language Revitalization, Alaska (Juneau Empire)
- Revive an Endangered Language (Alaska)
- Vanishing Languages (Maptia)
- Girl is Making Quechua Cool in Peru
- How Miami Tribe Got Its Language Back
- Isolated Dialect in Alaska (Russian)
- Saving the Arapaho Language
- She’s The Last Person Left Who Can Speak This (Wukchumni)
- Who Speaks Wukchumni? Marie Wilcox’s Dictionary
- Inuit Snow Terms: How Many and What Does It Mean?
- K. David Harrison – Enduring Voices Project, National Geographic
- Voynich Manuscript, Book No Living Person Can Understand
- Tarahumara (Rarámuri) People
- Recently Extinct Languages (Decolonial Atlas)
- Hai Kur Mamashu Shis (Yaghan language)
- Beautiful Song (Yaghan/English)
- Preserving Indigenous Languages (Magati Ke)
- Mamihlapinatapai (Yaghan language)
- 12 Palabras de Lenguas Indigenas
- Indigenous Language Links
- Aboriginal Language, Wikipedia Faces Cultural Hurdles (Nyungar)
- Australia Developing School Curriculum For Indigenous Languages
- Where Do Languages Go to Die? (John McWhorter)
- Guardians of a Vast Lake (Canada)