Wednesday, May 3, 2023 at 8 p.m. on KPBS TV / PBS App + Encore Sunday, May 7 at 8 p.m. on KPBS 2. David Attenborough presents seven of the most remarkable animal songs found in nature and explores the significance of these songs in the lives of their species. Each one - from the song of the largest lemur to the song of the humpback whale to the song of the lyrebird - was recorded in his lifetime. But will they soon be heard no more?