Kuruaya language
Kuruáya is a nearly extinct Tupian language of the state of Pará, in the Amazon region of Brazil. There is only one fluent speaker of Kuruáya, Odete Iawa, who is in her eighties or nineties or older. She was alive as of August 2020 and could very well be dead by now, rendering the language possibly extinct. References

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Tupian languages
Endangered Tupian languages