Loss of vocal culture and fitness costs in a critically endangered songbird | Proceedings of the Royal Society B: Biological Sciences https://royalsocietypublishing.org/doi/10.1098/rspb.2021.0225
Only the lonely: an endangered bird is forgetting its song as the species dies out https://theconversation.com/only-the-lonely-an-endangered-bird-is-forgetting-its-song-as-the-species-dies-out-156950