For several months each year, the haunting sounds of cagarros (calonectris borealis) envelop the coasts of the Azores. For several weeks each year, thousands of fledglings fall from the sky, crashing into street lights. Blind and vulnerable to lights at the beginning of life, survivors spend a long life at sea, with a noisy return once a year to find the same nest and mate. The bird’s life cycle is the basis for a film exploring the effects of light pollution, disorientation, bird navigation, and the mysteries of intergenerational memory. Marine biologists monitor nests on cliffs, neuroscientists create bird vision experiments, and geographers map the emission of light. After nightfall, volunteers search for fallen birds and listening sessions are created with the visually impaired community. Cagarros Assembly explores the connections between birds and people, sound and light, politics and lighting, empathy and indifference.