TIL that in 1800 Alexander von Humboldt found a pet parrot in Amazonia that was the last "speaker" of an extinct language. He documented what it said, and his notes are the only trace of this language
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The Parrot That Kept A Language Alive
https://www.mentalfloss.com/article/66479/parrot-kept-language-alive
In 1800, one explorer discovered a parrot who was speaking a dead language.