Every evening at dusk, listener Tara watches clouds of tiny birds dive-bomb into her boyfriend’s chimney. What are these creatures, and are they going to destroy the house? Ornithologist Margaret Rubega introduces us to these notoriously mysterious birds, and to the stubborn 19th-century artist-turned-scientist who was determined to study them. Special thanks to Barbara Boyle. Thanks also to songwriter Jay Ungar for the use of Ashokan Farewell, ©1983 by Swinging Door Music.Learn more about your ad choices. Visit podcastchoices.com/adchoices