The Oxygen Project on Instagram: "The sound you’re about to hear is both beautiful and heartbreaking. It’s the last known call of the Kaua‘i ʻŌʻō, a bird once native to the Hawaiian island of Kaua‘i. Recorded in 1987, this was the voice of the final surviving male, calling into an empty forest for a mate who would never answer. In the late 19th century, the ʻŌʻō’s rich, echoing song could be heard from the coast to the highest mountain forests. But habitat destruction, introduced predators, and