In exploring the upper Orinoco around 1800, Alexander von Humboldt learned of a tribe, the Atures, that had recently died out there. Their language had died with them, but Humboldt was still able to hear it spoken: “At the period of our voyage an old parrot was shown at Maypures, of which the inhabitants related, and the fact is worthy of observation, that ‘they did not understand what it said, because it spoke the language of the Atures.'”
From a 19th-century poem:
Where are now the youths who bred him
To pronounce their mother tongue?
Where the gentle maids who fed him
And who built his nest when young?
Humboldt managed to record phonetically 40 words spoken by the parrot, and in 1997 artist Rachel Berwick painstakingly taught two Amazon parrots to speak them. Can a language be said to survive if no one knows its meaning?