Scientists say heavy rainfall doesn't prevent hummingbirds from hovering at high speeds. The experiment was conducted by Victor Ortega-Jimenez and Robert Dudley of the University of California, Berkeley. The birds were placed individually in a Plexiglas cube that contained a perch and a feeder. With simulated heavy rainfall, the birds continued to feed. However, the birds hovering did adopt more horizontal body positions and increased wingbeat frequency during the heavy rain.