Video 1 Time-lapse video of bone marrow–derived eosinophils and a C. elegans dauer larva over the course of 80 min. Images were acquired once every 30 s and are displayed at a frame rate of 15/s. Collective migration toward the debris in the top right was not apparent. Stills from this video are shown in Fig. 1. Results represent three independent experiments. Bar, 50 µm.